Bug 2539781 (CVE-2026-67231) - CVE-2026-67231 rabbitmq: rabbitmq-server: RabbitMQ: Trust-store whitelist by Issuer+Serial only
Summary: CVE-2026-67231 rabbitmq: rabbitmq-server: RabbitMQ: Trust-store whitelist by ...
Keywords:
Status: NEW
Alias: CVE-2026-67231
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2540035
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-23 20:52 UTC by OSIDB Bzimport
Modified: 2026-09-24 13:02 UTC (History)
7 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-23 20:52:36 UTC
RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, The trust-store plugin installs a verify_fun that overrides {bad_cert, unknown_ca} / {bad_cert, selfsigned_peer} when the presented cert "matches" a whitelisted one. The match key is extract_issuer_id/1 → public_key:pkix_issuer_id/2 → {IssuerName, SerialNumber} , both fields are taken verbatim from the presented certificate body and contain no public-key, SKI, fingerprint or signature material. is_whitelisted/1 is a pure ets:member lookup; the stored full DER is used only for list/0 display and is never compared against the presented cert. cacerts is [], so the whitelisted cert is never used as a trust anchor for path validation either. TLS client-authentication bypass: an attacker who knows the issuer DN + serial of any whitelisted certificate can connect with a forged self-signed cert. Preconditions include rabbitmq_trust_store plugin enabled and used as the TLS verify_fun Attacker knows or can guess the {Issuer, Serial} of at least one whitelisted cert (non-secret; exposed via CLI/logs/any cert copy). This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.


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