CVE-2026-24122
Description
Cosign provides code signing and transparency for containers and binaries. In versions 3.0.4 and below, an issuing certificate with a validity that expires before the leaf certificate will be considered valid during verification even if the provided timestamp would mean the issuing certificate should be considered expired. When verifying artifact signatures using a certificate, Cosign first verifies the certificate chain using the leaf certificate's "not before" timestamp and later checks expiry of the leaf certificate using either a signed timestamp provided by the Rekor transparency log or from a timestamp authority, or using the current time. The root and all issuing certificates are assumed to be valid during the leaf certificate's validity. There is no impact to users of the public Sigstore infrastructure. This may affect private deployments with customized PKIs. This issue has been fixed in version 3.0.5.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Mixed 3 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Affected | — |
| sid | Fixed | 3.0.6-1 |
| forky | Affected | — |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | github.com/sigstore/cosign | <3.0.5 | 3.0.5 |
| Go | github.com/sigstore/cosign | | |
| Go | github.com/sigstore/cosign/v2 | | |
| Go | github.com/sigstore/cosign/v3 | <3.0.5 | 3.0.5 |
References
- https://security-tracker.debian.org/tracker/CVE-2026-24122
- https://github.com/sigstore/cosign/security/advisories/GHSA-wfqv-66vq-46rm
- https://nvd.nist.gov/vuln/detail/CVE-2026-24122
- https://github.com/sigstore/cosign/commit/3c9a7363f563db76d78e2de2cabd945450f3781e
- https://github.com/sigstore/cosign
- https://github.com/sigstore/cosign/releases/tag/v3.0.5
- https://www.suse.com/security/cve/CVE-2026-24122.html
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.