CVE-2026-54787 — sigstore-go fails to check signature timestamps against a signing key's validity period
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 Expiri…
Published: 2026-07-31 · CVSS: 3.1 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7