CVE-2026-22703
Description
Cosign provides code signing and transparency for containers and binaries. Prior to versions 2.6.2 and 3.0.4, Cosign bundle can be crafted to successfully verify an artifact even if the embedded Rekor entry does not reference the artifact's digest, signature or public key. When verifying a Rekor entry, Cosign verifies the Rekor entry signature, and also compares the artifact's digest, the user's public key from either a Fulcio certificate or provided by the user, and the artifact signature to the Rekor entry contents. Without these comparisons, Cosign would accept any response from Rekor as valid. A malicious actor that has compromised a user's identity or signing key could construct a valid Cosign bundle by including any arbitrary Rekor entry, thus preventing the user from being able to audit the signing event. This issue has been patched in versions 2.6.2 and 3.0.4.
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 | 2.6.2-1 |
| forky | Fixed | 2.6.2-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | github.com/sigstore/cosign/v3 | <3.0.4 | 3.0.4 |
| Go | github.com/sigstore/cosign/v2 | <2.6.2 | 2.6.2 |
| Go | github.com/sigstore/cosign | | |
References
- https://security-tracker.debian.org/tracker/CVE-2026-22703
- https://github.com/sigstore/cosign/security/advisories/GHSA-whqx-f9j3-ch6m
- https://nvd.nist.gov/vuln/detail/CVE-2026-22703
- https://github.com/sigstore/cosign/pull/4623
- https://github.com/sigstore/cosign/commit/6832fba4928c1ad69400235bbc41212de5006176
- https://github.com/sigstore/cosign
- https://www.suse.com/security/cve/CVE-2026-22703.html
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.