CVE-2026-22703

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.

The following products are affected by CVE-2026-22703 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-22703.

URL	Resource
https://github.com/sigstore/cosign/commit/6832fba4928c1ad69400235bbc41212de5006176
https://github.com/sigstore/cosign/pull/4623
https://github.com/sigstore/cosign/security/advisories/GHSA-whqx-f9j3-ch6m