rabbitmq-server — security advisory
RabbitMQ is a messaging and streaming broker. From 3.13.0 until 4.3.3, 4.2.9, 4.1.14, 4.0.23, and 3.13.18, JWKS Fetch Ignores HTTP Response Status Code - Signing Key Destruction Causes Authentication DoS (CWE-252). the JWKS key fetching mechanism in uaajwt.erl does not validate the HTTP response status code when downloading signing keys from the OAuth2 provider's JWKS endpoint. Non-200 responses (including 4xx and 5xx errors) are processed identically to successful responses. When the JWKS endpoint returns an error response with a valid-JSON body that lacks a keys field, all previously cached signing keys are destroyed, causing a persistent authentication denial of Files: deps/rabbitmqauthbackendoauth2/src/uaajwt.erl, lines 50-63 deps/rabbitmqauthbackendoauth2/src/uaajwks.erl, lines 5-7 deps/rabbitmqauthbackendoauth2/src/rabbitoauth2provider.erl, lines 98-107 Bug 1: HTTP status code ignored (uaajwt.erl:50-63): The Erlang httpc module returns {ok, {{HttpVersion, StatusCode, ReasonPhrase}, Headers, Body}}. The pattern {ok, {, , JwksBody}} matches ANY successful HTTP transaction Persistent authentication DoS: Once keys are destroyed, ALL OAuth2/JWT authentication fails for all users until a new successful JWKS refresh occurs Amplification: A single attacker can deny access to all legitimate OAuth2 users across the entire RabbitMQ. This issue is fixed in versions 4.3.3, 4.2.9, 4.1.14, 4.0.23, and 3.13.18.
- Products
- rabbitmq-server
- Affected versions
- 3.10.8-1.1, 3.10.8-1.1+deb12u1, 3.10.8-2, 3.10.8-3, 3.10.8-4, 3.12.1-1, 3.12.1-1.1, 4.0.5-1, 4.0.5-10, 4.0.5-11, 4.0.5-12, 4.0.5-13, 4.0.5-14, 4.0.5-2, 4.0.5-3, 4.0.5-4, 4.0.5-5, 4.0.5-6, 4.0.5-6+deb13u1, 4.0.5-6+deb13u2, 4.0.5-8, 4.0.5-9, 4.3.0-1, 4.3.0-2, 4.3.0-3, 4.3.2-1, 4.3.2-2, 4.3.2-3, 4.3.2-4, 4.3.2-5, 4.3.6-1
- Fixed versions
- 4.3.6-1
- CVEs
- CVE-2026-67409
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 29 Oct 2026, 22:35 UTC · Revision 1
Source evidence
RabbitMQ is a messaging and streaming broker. From 3.13.0 until 4.3.3, 4.2.9, 4.1.14, 4.0.23, and 3.13.18, JWKS Fetch Ignores HTTP Response Status Code - Signing Key Destruction Causes Authentication DoS (CWE-252). the JWKS key fetching mechanism in uaajwt.erl does not validate the HTTP response status code when downloading signing keys from the OAuth2 provider's JWKS endpoint. Non-200 responses (including 4xx and 5xx errors) are processed identically to successful responses. When the JWKS endpoint returns an error response with a valid-JSON body that lacks a keys field, all previously cached signing keys are destroyed, causing a persistent authentication denial of Files: deps/rabbitmqauthbackendoauth2/src/uaajwt.erl, lines 50-63 deps/rabbitmqauthbackendoauth2/src/uaajwks.erl, lines 5-7 deps/rabbitmqauthbackendoauth2/src/rabbitoauth2provider.erl, lines 98-107 Bug 1: HTTP status code ignored (uaajwt.erl:50-63): The Erlang httpc module returns {ok, {{HttpVersion, StatusCode, ReasonPhrase}, Headers, Body}}. The pattern {ok, {, , JwksBody}} matches ANY successful HTTP transaction Persistent authentication DoS: Once keys are destroyed, ALL OAuth2/JWT authentication fails for all users until a new successful JWKS refresh occurs Amplification: A single attacker can deny access to all legitimate OAuth2 users across the entire RabbitMQ. This issue is fixed in versions 4.3.3, 4.2.9, 4.1.14, 4.0.23, and 3.13.18.
osv:DEBIAN-CVE-2026-67409
rabbitmq-server
Fixed versions: Not specified
rabbitmq-server
Fixed versions: Not specified
rabbitmq-server
Fixed versions: 4.3.6-1
Complete source record
{
"id": "f67c6d14cd8c84e79523d3e2051f2badbe0be5950bc57baef8a7de4333ccafb7",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-67409",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-67409",
"summary": "RabbitMQ is a messaging and streaming broker. From 3.13.0 until 4.3.3, 4.2.9, 4.1.14, 4.0.23, and 3.13.18, JWKS Fetch Ignores HTTP Response Status Code - Signing Key Destruction Causes Authentication DoS (CWE-252). the JWKS key fetching mechanism in uaajwt.erl does not validate the HTTP response status code when downloading signing keys from the OAuth2 provider's JWKS endpoint. Non-200 responses (including 4xx and 5xx errors) are processed identically to successful responses. When the JWKS endpoint returns an error response with a valid-JSON body that lacks a keys field, all previously cached signing keys are destroyed, causing a persistent authentication denial of Files: deps/rabbitmqauthbackendoauth2/src/uaajwt.erl, lines 50-63 deps/rabbitmqauthbackendoauth2/src/uaajwks.erl, lines 5-7 deps/rabbitmqauthbackendoauth2/src/rabbitoauth2provider.erl, lines 98-107 Bug 1: HTTP status code ignored (uaajwt.erl:50-63): The Erlang httpc module returns {ok, {{HttpVersion, StatusCode, ReasonPhrase}, Headers, Body}}. The pattern {ok, {, , JwksBody}} matches ANY successful HTTP transaction Persistent authentication DoS: Once keys are destroyed, ALL OAuth2/JWT authentication fails for all users until a new successful JWKS refresh occurs Amplification: A single attacker can deny access to all legitimate OAuth2 users across the entire RabbitMQ. This issue is fixed in versions 4.3.3, 4.2.9, 4.1.14, 4.0.23, and 3.13.18.",
"evidence": "osv:DEBIAN-CVE-2026-67409",
"products": [
{
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{
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{
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{
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{
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{
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{
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{
"name": {
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{
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{
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
"value": "4.0.5-6+deb13u1",
"evidence": "/affected/1/versions"
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{
"value": "4.0.5-6+deb13u2",
"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
},
{
"value": "4.3.0-3",
"evidence": "/affected/1/versions"
},
{
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"evidence": "/affected/1/versions"
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{
"value": "4.3.2-2",
"evidence": "/affected/1/versions"
},
{
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"evidence": "/affected/1/versions"
},
{
"value": "4.3.2-4",
"evidence": "/affected/1/versions"
},
{
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"evidence": "/affected/1/versions"
},
{
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"evidence": "/affected/1/versions"
}
]
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{
"name": {
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"evidence": "/affected/2/package/name"
},
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"evidence": "/affected/2/ranges"
}
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"affected_versions": [
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{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
},
{
"value": "4.3.0-2",
"evidence": "/affected/2/versions"
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{
"value": "4.3.0-3",
"evidence": "/affected/2/versions"
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{
"value": "4.3.2-1",
"evidence": "/affected/2/versions"
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{
"value": "4.3.2-2",
"evidence": "/affected/2/versions"
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{
"value": "4.3.2-3",
"evidence": "/affected/2/versions"
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{
"value": "4.3.2-4",
"evidence": "/affected/2/versions"
},
{
"value": "4.3.2-5",
"evidence": "/affected/2/versions"
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]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-67409",
"aliases": [
"DEBIAN-CVE-2026-67409"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
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{
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"events": [
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}
],
"package": {
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"purl": "pkg:deb/debian/rabbitmq-server?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
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"3.10.8-2",
"3.10.8-3",
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"3.12.1-1",
"3.12.1-1.1",
"4.0.5-1",
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"4.3.2-4",
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],
"database_specific": {
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},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
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"events": [
{
"introduced": "0"
},
{
"fixed": "4.3.6-1"
}
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}
],
"package": {
"name": "rabbitmq-server",
"purl": "pkg:deb/debian/rabbitmq-server?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
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"4.0.5-11",
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],
"database_specific": {
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},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-10T22:00:16.275775983Z",
"provider": "osv",
"upstream": [
"CVE-2026-67409"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-67409"
]
},
"related_cves": [
{
"value": "CVE-2026-67409",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 276518,
"published_at": "2026-09-25T17:17:12.943+00:00"
}