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RabbitMQ: Trust-store whitelist by Issuer+Serial only

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-67231

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-67231

rabbitmq-server

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "rabbitmq",
    "product": "rabbitmq-server",
    "versions": [
      {
        "status": "affected",
        "version": ">= 3.13.0, < 3.13.15"
      },
      {
        "status": "affected",
        "version": ">= 4.0.0, < 4.0.20"
      },
      {
        "status": "affected",
        "version": ">= 4.1.0, < 4.1.11"
      },
      {
        "status": "affected",
        "version": ">= 4.2.0, < 4.2.6"
      }
    ]
  }
]
Related CVEs
CVE-2026-67231

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#3362 · Revision 1
Added to Heist Feed
Publisher date
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