CVE-2026-23831Medium· 5.3▾ SunlitRekor’s cose v0.0.1 entry implementation can panic on attacker-controlled input when canonicalizing a proposed entry with an empty spec.message. validate() returns nil (success) when message is empty, leaving sign1Msg uninitialized, and Ca…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 29.2 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.4%
0.4% → 0.4%
Last analysed / modified upstream
Rekor’s cose v0.0.1 entry implementation can panic on attacker-controlled input when canonicalizing a proposed entry with an empty spec.message. validate() returns nil (success) when message is empty, leaving sign1Msg uninitialized, and Canonicalize() later dereferences v.sign1Msg.Payload. A malformed proposed entry of the cose/v0.0.1 type can cause a panic on a thread within the Rekor process. The thread is recovered so the client receives a 500 error message and service still continues, so the availability impact of this is minimal.
github.com/sigstore/rekor: Rekor denial of service — rated Moderate by Red Hat. Released 2026-01-22, updated 2026-09-21.
Affected:
Fixed:
No fix planned:
Not affected:
Before applying this update, make sure all previously released errata relevant to your system have been applied.
For details on how to apply this update, refer to:
https://docs.redhat.com/en/documentation/red_hat_openshift_data_foundation/4.22/html/updating_openshift_data_foundation/updating-ocs-to-odf_rhodf https://access.redhat.com/errata/RHSA-2026:37387
Workarounds / mitigations:
Affected packages:
github.com/sigstore/rekor < 1.5.0Patched in:
github.com/sigstore/rekor 1.5.0Connected by shared product, vendor, weakness, or advisory.
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