medium5.3
CVE-2026-23831
Rekor's COSE v0.0.1 entry type nil pointer dereference in Canonicalize via empty Message
Impact
## Summary 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`. ## Impact 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. ## Patches Upgrade to v1.5.0 ## Workarounds None
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/sigstore/rekor | <= 1.4.3 | 1.5.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linuxfoundation | Rekor | before 1.5.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/sigstore/rekor/commit/39bae3d192bce48ef4ef2cbd1788fb5770fee8cd
- https://github.com/sigstore/rekor/releases/tag/v1.5.0
- https://github.com/sigstore/rekor/security/advisories/GHSA-273p-m2cw-6833
- https://github.com/advisories/GHSA-273p-m2cw-6833
- https://nvd.nist.gov/vuln/detail/CVE-2026-23831