{"cve":"CVE-2026-54787","nvd":{"published":"2026-07-31T23:17:25.287","modified":"2026-10-23T23:10:00.157","status":"Awaiting Analysis","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N","score":3.1},"cwes":["CWE-324"],"references":["https://github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188f35ed5f","https://github.com/sigstore/sigstore-go/pull/642","https://github.com/sigstore/sigstore-go/releases/tag/v1.2.1","https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm","https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:34.184483516+00:00"},"epss":{"cve":"CVE-2026-54787","score":0.00134,"percentile":0.02849,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-wqqc-jjcq-vfxm","url":"https://osv.dev/vulnerability/GHSA-wqqc-jjcq-vfxm","summary":"sigstore-go fails to check signature timestamps against a signing key's validity period","modified":"2026-09-10T03:51:12.439713893Z","packages":[{"ecosystem":"Go","name":"github.com/sigstore/sigstore-go","purl":"pkg:golang/github.com/sigstore/sigstore-go","ranges":["<1.2.1"],"fixed":["1.2.1"]}]},{"id":"GO-2026-6162","url":"https://osv.dev/vulnerability/GO-2026-6162","summary":"sigstore-go fails to check signature timestamps against a signing key's validity period in github.com/sigstore/sigstore-go","modified":"2026-08-18T15:00:17.558794471Z","packages":[{"ecosystem":"Go","name":"github.com/sigstore/sigstore-go","purl":"pkg:golang/github.com/sigstore/sigstore-go","ranges":["<1.2.1"],"fixed":["1.2.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}