Description
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.
Published: 2026-07-31
Score: 3.1 Low
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-wqqc-jjcq-vfxm sigstore-go fails to check signature timestamps against a signing key's validity period
History

Sat, 01 Aug 2026 00:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 31 Jul 2026 23:45:00 +0000

Type Values Removed Values Added
First Time appeared Sigstore
Sigstore sigstore-go
Vendors & Products Sigstore
Sigstore sigstore-go

Fri, 31 Jul 2026 22:30:00 +0000

Type Values Removed Values Added
Description 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.
Title sigstore-go fails to check signature timestamps against a signing key's validity period
Weaknesses CWE-324
References
Metrics cvssV3_1

{'score': 3.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N'}


Subscriptions

Sigstore Sigstore-go
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-31T23:36:13.441Z

Reserved: 2026-06-15T23:23:57.714Z

Link: CVE-2026-54787

cve-icon Vulnrichment

Updated: 2026-07-31T23:36:08.101Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-31T23:30:17Z

Weaknesses