251 lines
12 KiB
JSON
251 lines
12 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-2026-43974",
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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": "2026-05-04T18:23:25.574Z",
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"datePublished": "2026-06-08T14:12:36.957Z",
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"dateUpdated": "2026-06-08T16:34:38.989Z"
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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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"cpes": [
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"cpe:2.3:a:ninenines:gun:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"gun_http"
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],
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"packageName": "gun",
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"packageURL": "pkg:hex/gun",
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"product": "gun",
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"programFiles": [
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"src/gun_http.erl"
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],
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"programRoutines": [
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{
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"name": "gun_http:handle_inform/8"
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}
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],
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"repo": "https://github.com/ninenines/gun",
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"vendor": "ninenines",
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"versions": [
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{
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"lessThan": "2.4.0",
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"status": "affected",
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"version": "2.0.0",
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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:gun:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"gun_http"
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],
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"packageName": "ninenines/gun",
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"packageURL": "pkg:github/ninenines/gun",
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"product": "gun",
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"programFiles": [
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"src/gun_http.erl"
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],
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"programRoutines": [
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{
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"name": "gun_http:handle_inform/8"
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}
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],
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"repo": "https://github.com/ninenines/gun.git",
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"vendor": "ninenines",
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"versions": [
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{
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"lessThan": "5b48068c29ce5e112cb149b5857c7d4dc319a81b",
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"status": "affected",
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"version": "a3c2edbb8c807717e2f10520c6cf1e77a62eab2e",
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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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"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:gun:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "2.4.0",
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"versionStartIncluding": "2.0.0",
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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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"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": "Unexpected Status Code or Return Value vulnerability in ninenines gun (<tt>gun_http</tt> module) allows a malicious HTTP server to force the client into raw protocol mode via an unsolicited 101 Switching Protocols response.<p>In <tt>gun_http:handle_inform/8</tt>, when a <tt>101 Switching Protocols</tt> response is received over HTTP/1.1, the function verifies only that the <tt>Upgrade</tt> header is syntactically valid and that the stream reference is a plain <tt>reference()</tt>. It does not check whether the client ever sent an <tt>Upgrade</tt> or <tt>Connection: upgrade</tt> header on the corresponding request. Because this check is absent, any 101 response (solicited or not) causes gun to dispatch a <tt>gun_upgrade</tt> message to the caller and transition the entire connection to raw protocol mode.</p><p>A malicious or compromised HTTP server can send an unsolicited 101 response to any HTTP/1.1 request, causing the gun client to abandon HTTP framing for that connection. Once in raw mode, <tt>gun_raw</tt> applies no flow control (<tt>flow=infinity</tt>) and re-arms socket <tt>active</tt> mode after every received packet, so the server can flood the client with arbitrary bytes. These are forwarded as unbounded <tt>gun_data</tt> messages to the owner process, exhausting its mailbox and BEAM memory, ultimately crashing the VM.</p><p>This issue affects gun: from 2.0.0 before 2.4.0.</p>"
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}
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],
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"value": "Unexpected Status Code or Return Value vulnerability in ninenines gun (gun_http module) allows a malicious HTTP server to force the client into raw protocol mode via an unsolicited 101 Switching Protocols response.\n\nIn gun_http:handle_inform/8, when a 101 Switching Protocols response is received over HTTP/1.1, the function verifies only that the Upgrade header is syntactically valid and that the stream reference is a plain reference(). It does not check whether the client ever sent an Upgrade or Connection: upgrade header on the corresponding request. Because this check is absent, any 101 response (solicited or not) causes gun to dispatch a gun_upgrade message to the caller and transition the entire connection to raw protocol mode.\n\nA malicious or compromised HTTP server can send an unsolicited 101 response to any HTTP/1.1 request, causing the gun client to abandon HTTP framing for that connection. Once in raw mode, gun_raw applies no flow control (flow=infinity) and re-arms socket active mode after every received packet, so the server can flood the client with arbitrary bytes. These are forwarded as unbounded gun_data messages to the owner process, exhausting its mailbox and BEAM memory, ultimately crashing the VM.\n\nThis issue affects gun: from 2.0.0 before 2.4.0."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-220",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-220 Client-Server Protocol Manipulation"
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}
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]
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},
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{
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"capecId": "CAPEC-130",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-130 Excessive Allocation"
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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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"attackComplexity": "LOW",
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"attackRequirements": "NONE",
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"attackVector": "NETWORK",
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"baseScore": 8.7,
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"baseSeverity": "HIGH",
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"privilegesRequired": "NONE",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"userInteraction": "NONE",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
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"version": "4.0",
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"vulnAvailabilityImpact": "HIGH",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE"
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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-841",
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"description": "CWE-841 Improper Enforcement of Behavioral Workflow",
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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": "2026-06-08T16:34:38.989Z"
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},
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"references": [
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{
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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-2026-43974.html"
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},
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{
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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-2026-43974"
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},
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{
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"tags": [
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"patch"
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],
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"url": "https://github.com/ninenines/gun/commit/5b48068c29ce5e112cb149b5857c7d4dc319a81b"
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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": "gun HTTP/1.1 client accepts unsolicited 101 Switching Protocols response allowing server-driven protocol hijack and OOM",
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"x_generator": {
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"engine": "cvelib 1.8.0"
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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": "2026-06-08T15:41:42.657559Z",
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"id": "CVE-2026-43974",
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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": "yes"
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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": "2026-06-08T15:41:49.498Z"
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}
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}
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]
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}
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} |