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Moderate severityOSV Advisory· Published Jan 22, 2026· Updated Jan 23, 2026

Rekor COSE v0.0.1 Canonicalize crashes when passed empty Message

CVE-2026-23831

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/sigstore/rekorGo
< 1.5.01.5.0

Affected products

129

Patches

Vulnerability mechanics

References

5

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