309 lines
16 KiB
JSON
309 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-43969",
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"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"state": "PUBLISHED",
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"assignerShortName": "EEF",
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"dateReserved": "2026-05-04T18:23:25.573Z",
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"datePublished": "2026-05-11T18:06:40.667Z",
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"dateUpdated": "2026-10-09T06:57:15.234Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"collectionURL": "https://repo.hex.pm",
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"cpes": [
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"cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"cow_cookie"
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],
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"packageName": "cowlib",
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"packageURL": "pkg:hex/cowlib",
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"product": "cowlib",
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"programFiles": [
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"src/cow_cookie.erl"
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],
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"programRoutines": [
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{
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"name": "cow_cookie:cookie/1"
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}
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],
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"repo": "https://github.com/ninenines/cowlib",
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"vendor": "ninenines",
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"versions": [
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{
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"lessThan": "2.21.0",
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"status": "affected",
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"version": "2.9.0",
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"versionType": "semver"
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}
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]
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},
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{
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"collectionURL": "https://github.com",
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"cpes": [
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"cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"cow_cookie"
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],
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"packageName": "ninenines/cowlib",
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"packageURL": "pkg:github/ninenines/cowlib",
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"product": "cowlib",
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"programFiles": [
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"src/cow_cookie.erl"
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],
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"programRoutines": [
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{
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"name": "cow_cookie:cookie/1"
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}
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],
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"repo": "https://github.com/ninenines/cowlib",
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"vendor": "ninenines",
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"versions": [
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{
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"lessThan": "c17fd73945ef536cccecc492d286fb6b6d1c3307",
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"status": "affected",
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"version": "f017f8a0ecbffd5033d9ab49bf180186f7a523a7",
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"versionType": "git"
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}
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]
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}
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],
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"configurations": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>The application must pass attacker-controlled bytes as cookie names or values to <code>cow_cookie:cookie/1</code>. Applications that construct cookie lists exclusively from trusted, application-controlled values are not affected.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "The application must pass attacker-controlled bytes as cookie names or values to `cow_cookie:cookie/1`. Applications that construct cookie lists exclusively from trusted, application-controlled values are not affected."
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}
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],
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"value": "The application must pass attacker-controlled bytes as cookie names or values to cow_cookie:cookie/1. Applications that construct cookie lists exclusively from trusted, application-controlled values are not affected."
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"cpeMatch": [
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{
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"criteria": "cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "2.21.0",
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"versionStartIncluding": "2.9.0",
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"vulnerable": true
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}
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],
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"negate": false,
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"operator": "OR"
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}
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],
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"operator": "AND"
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "Peter Ullrich"
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},
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{
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"lang": "en",
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"type": "remediation developer",
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"value": "Loïc Hoguin"
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},
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{
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"lang": "en",
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"type": "coordinator",
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"value": "Jonatan Männchen / EEF"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in ninenines cowlib allows HTTP request splitting and cookie smuggling via unvalidated cookie name and value fields.</p>\n<p><code>cow_cookie:cookie/1</code> in cowlib builds a client-side <code>Cookie:</code> request header from a list of name-value pairs without validating either field. An attacker who controls the cookie names or values passed to this function can inject <code>;</code>, <code>,</code>, CR, LF, or TAB characters into the serialized header. This enables two classes of attack: cookie smuggling within a single header (e.g. injecting <code>; admin=1</code> to introduce a phantom cookie that the receiving server treats as authentic) and HTTP request header splitting (injecting CRLF to append arbitrary headers or smuggle a complete second request against a shared upstream proxy). The decoder side (<code>parse_cookie_name/1</code>, <code>parse_cookie_value/1</code>) and <code>setcookie/3</code> already validate and reject these characters; the encoder alone is missing the check.</p>\n<p>This issue affects cowlib: from 2.9.0 before 2.21.0.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in ninenines cowlib allows HTTP request splitting and cookie smuggling via unvalidated cookie name and value fields.\n\n`cow_cookie:cookie/1` in cowlib builds a client-side `Cookie:` request header from a list of name-value pairs without validating either field. An attacker who controls the cookie names or values passed to this function can inject `;`, `,`, CR, LF, or TAB characters into the serialized header. This enables two classes of attack: cookie smuggling within a single header (e.g. injecting `; admin=1` to introduce a phantom cookie that the receiving server treats as authentic) and HTTP request header splitting (injecting CRLF to append arbitrary headers or smuggle a complete second request against a shared upstream proxy). The decoder side (`parse_cookie_name/1`, `parse_cookie_value/1`) and `setcookie/3` already validate and reject these characters; the encoder alone is missing the check.\n\nThis issue affects cowlib: from 2.9.0 before 2.21.0."
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}
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],
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"value": "Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in ninenines cowlib allows HTTP request splitting and cookie smuggling via unvalidated cookie name and value fields.\n\ncow_cookie:cookie/1 in cowlib builds a client-side Cookie: request header from a list of name-value pairs without validating either field. An attacker who controls the cookie names or values passed to this function can inject ;, ,, CR, LF, or TAB characters into the serialized header. This enables two classes of attack: cookie smuggling within a single header (e.g. injecting ; admin=1 to introduce a phantom cookie that the receiving server treats as authentic) and HTTP request header splitting (injecting CRLF to append arbitrary headers or smuggle a complete second request against a shared upstream proxy). The decoder side (parse_cookie_name/1, parse_cookie_value/1) and setcookie/3 already validate and reject these characters; the encoder alone is missing the check.\n\nThis issue affects cowlib: from 2.9.0 before 2.21.0."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-105",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-105 HTTP Request Splitting"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV4_0": {
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"attackComplexity": "LOW",
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"attackRequirements": "PRESENT",
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"attackVector": "LOCAL",
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"baseScore": 2.1,
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"baseSeverity": "LOW",
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"privilegesRequired": "NONE",
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"providerUrgency": "NOT_DEFINED",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "LOW",
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"userInteraction": "NONE",
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"valueDensity": "NOT_DEFINED",
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"vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N",
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"version": "4.0",
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"vulnAvailabilityImpact": "NONE",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "LOW",
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"vulnerabilityResponseEffort": "NOT_DEFINED"
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},
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-93",
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"description": "CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')",
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"lang": "en",
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"type": "CWE"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"shortName": "EEF",
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"dateUpdated": "2026-10-09T06:57:15.234Z"
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},
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"references": [
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{
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"name": "GitHub Advisory",
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"tags": [
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"patch"
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],
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"url": "https://github.com/erlef/cowlib/commit/177953dd51540da11090666c1f007214127a1144"
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},
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{
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"name": "EEF CNA record for CVE-2026-43969",
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"tags": [
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"related",
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"third-party-advisory"
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],
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"url": "https://cna.erlef.org/cves/CVE-2026-43969.html"
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},
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{
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"name": "OSV record EEF-CVE-2026-43969",
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"tags": [
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"related"
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],
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"url": "https://osv.dev/vulnerability/EEF-CVE-2026-43969"
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},
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{
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"name": "Introducing commit f017f8a in ninenines/cowlib",
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"tags": [
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"related"
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],
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"url": "https://github.com/ninenines/cowlib/commit/f017f8a0ecbffd5033d9ab49bf180186f7a523a7"
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},
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{
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"name": "Fix commit c17fd73 in ninenines/cowlib",
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"tags": [
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"patch"
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],
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"url": "https://github.com/ninenines/cowlib/commit/c17fd73945ef536cccecc492d286fb6b6d1c3307"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"title": "Cookie Request Header Injection via Unvalidated Encoder in cow_cookie:cookie/1",
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"workarounds": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Validate inputs into <code>cow_cookie:cookie/1</code> to only include valid cookie name and value characters as defined in RFC 6265 Section 4.1.1 before passing them to the function.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "Validate inputs into `cow_cookie:cookie/1` to only include valid cookie name and value characters as defined in RFC 6265 Section 4.1.1 before passing them to the function."
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}
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],
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"value": "Validate inputs into cow_cookie:cookie/1 to only include valid cookie name and value characters as defined in RFC 6265 Section 4.1.1 before passing them to the function."
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}
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]
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-05-11T18:55:16.028478Z",
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"id": "CVE-2026-43969",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-05-11T18:55:26.121Z"
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}
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}
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]
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}
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} |