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.
How to fix
- linuxfoundation rekor1.5.0 or later
- github.com/sigstore/rekor1.5.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linuxfoundation rekor | v < 1.5.0 | 1.5.0 |
| github.com/sigstore/rekorGo | v < 1.5.0 | 1.5.0 |
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