{"cve":"CVE-2026-49834","nvd":{"published":"2026-07-17T20:17:21.963","modified":"2026-10-24T20:10:00.137","status":"Analyzed","description":"sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.0, a verifier configured with WithTransparencyLog(N>1) or WithSignedCertificateTimestamps(N>1) counts verified witnesses per entry or per validation path rather than per log authority, allowing a single compromised transparency log or CT log to satisfy multi-log threshold requirements and defeat the multi-log policy. This issue is fixed in version 1.2.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-347"],"references":["https://github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd5a41dcb85a159207","https://github.com/sigstore/sigstore-go/pull/633","https://github.com/sigstore/sigstore-go/releases/tag/v1.2.0","https://github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6"],"products":["sigstore:sigstore-go"],"source":"nvd","synced_at":"2026-10-25T17:50:08.599881581+00:00"},"epss":{"cve":"CVE-2026-49834","score":0.00181,"percentile":0.076,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-9vcr-p3rj-q5q6","url":"https://osv.dev/vulnerability/GHSA-9vcr-p3rj-q5q6","summary":"sigstore-go has a multi-log threshold bypass via single compromised log","modified":"2026-09-10T03:51:11.356574113Z","packages":[{"ecosystem":"Go","name":"github.com/sigstore/sigstore-go","purl":"pkg:golang/github.com/sigstore/sigstore-go","ranges":["<1.2.0"],"fixed":["1.2.0"]}]},{"id":"GO-2026-5952","url":"https://osv.dev/vulnerability/GO-2026-5952","summary":"sigstore-go has a multi-log threshold bypass via single compromised log in github.com/sigstore/sigstore-go","modified":"2026-07-23T16:31:01.793262723Z","packages":[{"ecosystem":"Go","name":"github.com/sigstore/sigstore-go","purl":"pkg:golang/github.com/sigstore/sigstore-go","ranges":["<1.2.0"],"fixed":["1.2.0"]}]}],"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."]}