{"id":"UBUNTU-CVE-2026-49834","details":"sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.0, a verifier configured with WithTransparencyLog(N\u003e1) or WithSignedCertificateTimestamps(N\u003e1) 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.","modified":"2026-08-04T11:00:09.657351583Z","published":"2026-07-17T20:17:00Z","upstream":["CVE-2026-49834"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-49834"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-49834"},{"type":"REPORT","url":"https://github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6"},{"type":"REPORT","url":"https://github.com/sigstore/sigstore-go/pull/633"}],"affected":[{"package":{"name":"sigstore-go","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/sigstore-go?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.7.1-2","0.7.3-1","0.7.3-2","1.1.4-1","1.1.4-1ubuntu0.26.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"golang-github-sigstore-sigstore-go-dev","binary_version":"1.1.4-1ubuntu0.26.04.1~esm1"},{"binary_version":"1.1.4-1ubuntu0.26.04.1~esm1","binary_name":"sigstore-go"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49834.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}