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BIT-cosign-2026-39395 — Cosign's verify-blob-attestation reports false positive when payload parsing fails

Affected: Bitnami: cosign

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.

Withdrawn: CLEANSTART-2026-JX39152 — Security fixes in spire-server 1.14.7-r0

Withdrawn by the publisher.

Affected: CleanStart: spire-server

Package spire-server version 1.14.7-r0 fixes 16 vulnerabilities: CVE-2026-49834, CVE-2026-24122, CVE-2026-39395, CVE-2026-41178, CVE-2026-41568...

EUVD-2026-281260

fkie_cve-2026-39395

GHSA-w6c6-c85g-mmv6 — Cosign's verify-blob-attestation reports false positive when payload parsing fails

Affected: Go: github.com/sigstore/cosign

## Description

`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.

## Impact

When `cosign verify-blob-attestation` is used without `--check-claims` set to `true`, an attestation that has a valid signature but a malformed or unparsable payload would be incorrectly validated. Additionally, systems relying on `--type <predicate type>` to reject attestations with mismatched types would be lead to trust the unexpected attestation type.

## Patches

v3.0.6, v2.6.3

## Workarounds

Always set `--check-claims=true` for attestation verification.

openSUSE-SU-2026:10753-1 — cosign-3.0.6-1.1 on GA media

cosign-3.0.6-1.1 on GA media

SUSE-SU-2026:22344-1 — Security update for cosign

Security update for cosign

UBUNTU-CVE-2026-39395

Affected: Ubuntu:25.10: cosign, Ubuntu:Pro:26.04:LTS: cosign