Low 3.1Published Jul 31, 2026

CVE-2026-54787sigstore-go fails to check signature timestamps against a signing key's validity period

Updated under an hour ago (Oct 27, 2026, 3:50 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for sigstore-go

Exploited in the last 30 days

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.

CVSS: 3.1 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
Weakness (CWE): CWE-324
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Jul 31, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

sigstore sigstore-go sigstore:go (from the name)	before 1.2.1	CNA record

References

References

https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm	x-refsource-confirm
https://github.com/sigstore/sigstore-go/pull/642	x-refsource-misc
https://github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188f35ed5f	x-refsource-misc
https://github.com/sigstore/sigstore-go/releases/tag/v1.2.1	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.