cosign: Cosign provides code signing and transparency for containers and binaries
CVE-2026-39395 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-39395, released April 7, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Cosign provides code signing and transparency for containers and binaries. Prior to 3.0.6 and 2.6.3, cosign verify-blob-attestation may erroneously report a "Verified OK" result for attestations with malformed payloads or mismatched predicate types. For old-format bundles and detached signatures, this was due to a logic flaw in the error handling of the predicate type validation. For new-format bundles, the predicate type validation was bypassed completely. This vulnerability is fixed in 3.0.6 and 2.6.3.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| cosign · Debian 14 | 2.6.3-1 | DEBIAN-CVE-2026-39395 | Apr 7, 2026 |
| cosign · opensuse-leap 16.0 | 3.0.6-160000.1.1 | OPENSUSE-SU-2026:21036-1 | Jun 22, 2026 |
| cosign · sles 15.7 | 3.0.6-150400.3.42.1 | SUSE-SU-2026:2365-1 | Jun 11, 2026 |
| cosign · sles 16.0 | 3.0.6-160000.1.1 | SUSE-SU-2026:22344-1 | Jun 22, 2026 |
| govulncheck-vulndb · opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | OPENSUSE-SU-2026:21483-1 | Jul 30, 2026 |
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