Vulnerability Description
Rekor is a software supply chain transparency log. In versions 1.4.3 and below, the entry implementation can panic on attacker-controlled input when canonicalizing a proposed entry with an empty spec.message, causing nil Pointer Dereference. Function 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. This issue has been fixed in version 1.5.0.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linuxfoundation | Rekor | < 1.5.0 |
Related Weaknesses (CWE)
References
- https://github.com/sigstore/rekor/commit/39bae3d192bce48ef4ef2cbd1788fb5770fee8cPatch
- https://github.com/sigstore/rekor/releases/tag/v1.5.0ProductRelease Notes
- https://github.com/sigstore/rekor/security/advisories/GHSA-273p-m2cw-6833Vendor Advisory
FAQ
What is CVE-2026-23831?
CVE-2026-23831 is a vulnerability with a CVSS score of 5.3 (MEDIUM). Rekor is a software supply chain transparency log. In versions 1.4.3 and below, the entry implementation can panic on attacker-controlled input when canonicalizing a proposed entry with an empty spec....
How severe is CVE-2026-23831?
CVE-2026-23831 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23831?
Check the references section above for vendor advisories and patch information. Affected products include: Linuxfoundation Rekor.