CVE-2026-54787

low

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.

References

https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm

https://github.com/sigstore/sigstore-go/releases/tag/v1.2.1

https://github.com/sigstore/sigstore-go/pull/642

https://github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188f35ed5f

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-51665

Details

Source: Mitre, NVD

Published: 2026-07-31

Updated: 2026-09-10

Named Vulnerability: GO-2026-6162Named Vulnerability: GHSA-wqqc-jjcq-vfxm

Risk Information

CVSS v2

Base Score: 2.1

Vector: CVSS2#AV:N/AC:H/Au:S/C:N/I:P/A:N

Severity: Low

CVSS v3

Base Score: 3.1

Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

Severity: Low

EPSS

EPSS: 0.0009