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

CVE ID :CVE-2026-54787

Published : July 31, 2026, 11:17 p.m. | 31 minutes ago

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.

Severity: 3.1 | LOW

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