{"id":"CVE-2026-48758","aliases":["GHSA-jfc7-64v2-mr8c"],"url":"https://o3.security/vulnerability/CVE-2026-48758","summary":"sigstore-js: DSSE payloadType type-binding failure","details":"sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 3.2.1, the preAuthEncoding function in @sigstore/core uses Node.js ascii encoding when converting the PAE string to bytes, allowing payloadType to be mutated after signing without invalidating the signature and breaking the type-binding guarantee that DSSE is designed to provide. This issue is fixed in version 3.2.1.","published":"2026-07-14T20:36:28.641Z","modified":"2026-08-12T03:51:33.223601945Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L"},"epss":{"score":0.00264,"percentile":0.18147,"asOf":"2026-09-08"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@sigstore/core","fixedVersion":"3.2.1"}],"fix":{"url":"https://github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7","label":"sigstore/sigstore-js@b5aa4f1"},"references":[{"type":"WEB","url":"https://github.com/sigstore/sigstore-js/releases/tag/%40sigstore%2Fcore%403.2.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48758.json"},{"type":"ADVISORY","url":"https://github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48758"},{"type":"FIX","url":"https://github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7"},{"type":"FIX","url":"https://github.com/sigstore/sigstore-js/pull/1657"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:33.223601945Z"}}