268 lines
12 KiB
JSON
268 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-2026-39803",
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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": "2026-04-07T12:28:54.916Z",
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"datePublished": "2026-05-13T13:36:09.648Z",
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"dateUpdated": "2026-05-27T15:40:37.538Z"
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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:mtrudel:bandit:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Bandit.HTTP1.Socket'"
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],
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"packageName": "bandit",
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"packageURL": "pkg:hex/bandit",
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"product": "bandit",
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"programFiles": [
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"lib/bandit/http1/socket.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Bandit.HTTP1.Socket':read_data/2"
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},
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{
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"name": "'Elixir.Bandit.HTTP1.Socket':do_read_chunked_data!/5"
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}
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],
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"repo": "https://github.com/mtrudel/bandit",
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"vendor": "mtrudel",
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"versions": [
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{
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"lessThan": "1.11.1",
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"status": "affected",
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"version": "1.4.0",
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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:mtrudel:bandit:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Bandit.HTTP1.Socket'"
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],
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"packageName": "mtrudel/bandit",
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"packageURL": "pkg:github/mtrudel/bandit",
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"product": "bandit",
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"programFiles": [
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"lib/bandit/http1/socket.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Bandit.HTTP1.Socket':read_data/2"
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},
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{
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"name": "'Elixir.Bandit.HTTP1.Socket':do_read_chunked_data!/5"
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}
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],
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"repo": "https://github.com/mtrudel/bandit",
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"vendor": "mtrudel",
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"versions": [
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{
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"lessThan": "ae3520dfdbfab115c638f8c7f6f6b805db34e1ab",
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"status": "affected",
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"version": "903e209a521bc216b9f9065c01ae9a0cac2d5a10",
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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:mtrudel:bandit:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "1.11.1",
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"versionStartIncluding": "1.4.0",
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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": "Mat Trudel"
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},
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{
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"lang": "en",
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"type": "analyst",
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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": "Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion.<p>The chunked clause of <tt>'Elixir.Bandit.HTTP1.Socket':read_data/2</tt> in <tt>lib/bandit/http1/socket.ex</tt> ignores the caller-supplied <tt>:length</tt> option when reading HTTP/1 chunked request bodies. Instead of capping the accumulated body at the configured limit (e.g. <tt>Plug.Parsers</tt>' default 8 MB), <tt>do_read_chunked_data!/5</tt> buffers every received chunk into an iolist unconditionally and materializes the entire body as a single binary. The function always returns <tt>{:ok, body, ...}</tt>, so callers cannot interpose a 413 response.</p><p>Because <tt>Plug.Parsers</tt> runs before routing and authentication in the standard Phoenix endpoint, an unauthenticated attacker needs no valid route or credentials. Sending a single <tt>Transfer-Encoding: chunked</tt> POST request with an arbitrarily large body to any path causes the BEAM process to exhaust available memory and be terminated by the OS OOM killer.</p><p>The content-length path in the same function correctly enforces the limit and is not affected.</p><p>This issue affects bandit: from 1.4.0 before 1.11.1.</p>"
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}
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],
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"value": "Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion.\n\nThe chunked clause of 'Elixir.Bandit.HTTP1.Socket':read_data/2 in lib/bandit/http1/socket.ex ignores the caller-supplied :length option when reading HTTP/1 chunked request bodies. Instead of capping the accumulated body at the configured limit (e.g. Plug.Parsers' default 8 MB), do_read_chunked_data!/5 buffers every received chunk into an iolist unconditionally and materializes the entire body as a single binary. The function always returns {:ok, body, ...}, so callers cannot interpose a 413 response.\n\nBecause Plug.Parsers runs before routing and authentication in the standard Phoenix endpoint, an unauthenticated attacker needs no valid route or credentials. Sending a single Transfer-Encoding: chunked POST request with an arbitrarily large body to any path causes the BEAM process to exhaust available memory and be terminated by the OS OOM killer.\n\nThe content-length path in the same function correctly enforces the limit and is not affected.\n\nThis issue affects bandit: from 1.4.0 before 1.11.1."
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}
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],
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"impacts": [
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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-770",
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"description": "CWE-770 Allocation of Resources Without Limits or Throttling",
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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": "2026-05-27T15:40:37.538Z"
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},
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"references": [
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{
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"tags": [
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"vendor-advisory",
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"related"
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],
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"url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-9q9q-324x-93r2"
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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://cna.erlef.org/cves/CVE-2026-39803.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-2026-39803"
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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/mtrudel/bandit/commit/ae3520dfdbfab115c638f8c7f6f6b805db34e1ab"
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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": "HTTP/1 chunked body reader ignores length cap in bandit",
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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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"references": [
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{
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"url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-9q9q-324x-93r2",
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"tags": [
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"exploit"
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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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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-05-13T14:41:58.440838Z",
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"id": "CVE-2026-39803",
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"options": [
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{
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"Exploitation": "poc"
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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": "2026-05-13T14:43:25.158Z"
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}
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}
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]
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}
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} |