257 lines
12 KiB
JSON
257 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-2026-32688",
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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": "2026-03-13T09:12:14.475Z",
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"datePublished": "2026-04-27T13:45:35.160Z",
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"dateUpdated": "2026-04-29T17:08:07.227Z"
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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:elixir-plug:plug_cowboy:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Plug.Cowboy.Conn'"
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],
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"packageName": "plug_cowboy",
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"packageURL": "pkg:hex/plug_cowboy",
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"product": "plug_cowboy",
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"programFiles": [
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"lib/plug/cowboy/conn.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Plug.Cowboy.Conn':conn/1"
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}
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],
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"repo": "https://github.com/elixir-plug/plug_cowboy",
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"vendor": "elixir-plug",
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"versions": [
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{
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"lessThan": "2.8.1",
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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:elixir-plug:plug_cowboy:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"'Elixir.Plug.Cowboy.Conn'"
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],
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"packageName": "elixir-plug/plug_cowboy",
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"packageURL": "pkg:github/elixir-plug/plug_cowboy",
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"product": "plug_cowboy",
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"programFiles": [
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"lib/plug/cowboy/conn.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.Plug.Cowboy.Conn':conn/1"
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}
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],
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"repo": "https://github.com/elixir-plug/plug_cowboy",
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"vendor": "elixir-plug",
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"versions": [
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{
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"lessThan": "bfb34cb45eb354e56437f7023fb306de1bf9c19b",
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"status": "affected",
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"version": "12ecfd024bb179d48b018fecf074e43fe6a19c83",
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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:elixir-plug:plug_cowboy:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "2.8.1",
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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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"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 elixir-plug plug_cowboy allows unauthenticated remote denial of service via atom table exhaustion.<p><tt>Plug.Cowboy.Conn.conn/1</tt> in <tt>lib/plug/cowboy/conn.ex</tt> calls <tt>String.to_atom/1</tt> on the value returned by <tt>:cowboy_req.scheme/1</tt>. For HTTP/2 connections, cowlib passes the client-supplied <tt>:scheme</tt> pseudo-header value through verbatim without validation. Each unique value permanently allocates a new entry in the BEAM atom table. Since atoms are never garbage-collected and the atom table has a fixed limit (default 1,048,576), an unauthenticated attacker can exhaust the table by sending HTTP/2 requests with unique <tt>:scheme</tt> values, causing the Erlang VM to abort with <tt>system_limit</tt> and taking down the entire node.</p><p>This vulnerability does not affect HTTP/1.1, where cowboy derives the scheme from the listener type rather than from a client-supplied header.</p><p>This issue affects plug_cowboy: from 2.0.0 before 2.8.1.</p>"
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}
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],
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"value": "Allocation of Resources Without Limits or Throttling vulnerability in elixir-plug plug_cowboy allows unauthenticated remote denial of service via atom table exhaustion.\n\nPlug.Cowboy.Conn.conn/1 in lib/plug/cowboy/conn.ex calls String.to_atom/1 on the value returned by :cowboy_req.scheme/1. For HTTP/2 connections, cowlib passes the client-supplied :scheme pseudo-header value through verbatim without validation. Each unique value permanently allocates a new entry in the BEAM atom table. Since atoms are never garbage-collected and the atom table has a fixed limit (default 1,048,576), an unauthenticated attacker can exhaust the table by sending HTTP/2 requests with unique :scheme values, causing the Erlang VM to abort with system_limit and taking down the entire node.\n\nThis vulnerability does not affect HTTP/1.1, where cowboy derives the scheme from the listener type rather than from a client-supplied header.\n\nThis issue affects plug_cowboy: from 2.0.0 before 2.8.1."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-125",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-125 Flooding"
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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": "2026-04-29T17:08:07.227Z"
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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/elixir-plug/plug_cowboy/security/advisories/GHSA-q8x4-x7mp-5vg2"
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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-2026-32688.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-2026-32688"
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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/elixir-plug/plug_cowboy/commit/bfb34cb45eb354e56437f7023fb306de1bf9c19b"
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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": "Atom table exhaustion via HTTP/2 :scheme pseudo-header in plug_cowboy",
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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": "Disable HTTP/2 on the <tt>Plug.Cowboy.https/3</tt> listener by passing <tt>protocol_options: %{protocols: [:http]}</tt> in the cowboy options. This restricts the listener to HTTP/1.1, where the scheme is derived from the listener type and is not attacker-controlled."
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}
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],
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"value": "Disable HTTP/2 on the Plug.Cowboy.https/3 listener by passing protocol_options: %{protocols: [:http]} in the cowboy options. This restricts the listener to HTTP/1.1, where the scheme is derived from the listener type and is not attacker-controlled."
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}
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],
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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": "2026-04-27T19:04:33.154446Z",
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"id": "CVE-2026-32688",
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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": "2026-04-27T20:11:22.651Z"
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}
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}
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]
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}
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} |