CVE-2026-54787
sigstore-go fails to check signature timestamps against a signing key's validity period
CVSS Score
3.1
EPSS Score
0.0%
EPSS Percentile
0th
sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go does not check a bundle signing timestamp against the validity window of an ExpiringKey wrapping a self-managed long-lived signing key without a certificate, which can allow an attacker holding expired key material to sign accepted bundles. This issue is fixed in version 1.2.1.
| CWE | CWE-324 |
| Vendor | sigstore |
| Product | sigstore-go |
| Published | Jul 31, 2026 |
| Last Updated | Jul 31, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
sigstore / sigstore-go
< 1.2.1
References
github.com: https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm github.com: https://github.com/sigstore/sigstore-go/pull/642 github.com: https://github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188f35ed5f github.com: https://github.com/sigstore/sigstore-go/releases/tag/v1.2.1