CVE-2026-22703
Cosign verification accepts any valid Rekor entry under certain conditions
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.
How to fix CVE-2026-22703
To remediate CVE-2026-22703, upgrade the affected package to a fixed version below.
- —upgrade to 2.6.2 or later
- —no fix listed
- —no fix listed
- —upgrade to 2.6.2 or later
- —upgrade to 2.6.2 or later
- —upgrade to 3.0.4 or later
- —upgrade to 3.0.4 or later
Is CVE-2026-22703 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (7)
- from 0, < 2.6.2, >= 3.0.0, < 3.0.4
- from 0
- from 0
- from 0, < 2.6.2
- from 0, < 2.6.2
- from 0, < 3.0.4
- from 0, < 3.0.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |