CVE-2026-67409

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.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-252"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67409.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "range": [
                        {
                            "introduced": "4.1.0"
                        },
                        {
                            "fixed": "4.1.14"
                        },
                        {
                            "introduced": "4.0.0"
                        },
                        {
                            "fixed": "4.0.23"
                        },
                        {
                            "introduced": "3.13.0"
                        },
                        {
                            "fixed": "3.13.18"
                        }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                }
            ]
        }
    ]
}

References

Affected packages

Git / github.com/rabbitmq/rabbitmq-server

Affected ranges

Type

GIT

Repo

https://github.com/rabbitmq/rabbitmq-server

Events

Introduced

95c501fbad76c66156346cf364d158d6e30aa4d9

Fixed

47d6d6457c7d1a440daed643cb7d76bba313e79c

Introduced

1929eeadf9b2bac12c5434fb56884ef27370580e

Fixed

1d284b2d2a1e2f845ad22b0d5ee38ec372d50802

Database specific

Show details

{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "4.2.0"
                },
                {
                    "fixed": "4.2.9"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "4.3.0"
                },
                {
                    "fixed": "4.3.3"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "original_tag": "v4.2.9",
            "range": [
                {
                    "fixed": "47d6d6457c7d1a440daed643cb7d76bba313e79c"
                }
            ],
            "source": "REFERENCES_TAG"
        },
        {
            "original_tag": "v4.3.3",
            "range": [
                {
                    "fixed": "1d284b2d2a1e2f845ad22b0d5ee38ec372d50802"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

v4.*

v4.2.0

v4.2.1

v4.2.2

v4.2.3

v4.2.4

v4.2.5

v4.2.6

v4.2.7

v4.2.8

v4.3.0

v4.3.1

v4.3.2

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-67409.json"