CVE-2026-54787

lowCVSS 3.1covered by 1 sourcefirst seen 2026-07-31

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.

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Exploitation outlook

Low exploitation risk0.09% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all EPSS-scored CVEs.

Advisory coverage (1)

lowCVE-2026-54787: sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go…nvd · 2026-07-31

External references

NVD record for CVE-2026-54787

CVE.org record

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