{"id":"CVE-2026-48758","state":"PUBLISHED","title":"sigstore-js: DSSE payloadType type-binding failure","description":"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.","publishedAt":"2026-07-14T20:36:28.641Z","updatedAt":"2026-07-15T12:54:55.445Z","severity":{"score":5.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["sigstore sigstore-js"],"affected":[{"vendor":"sigstore","product":"sigstore-js","versions":[{"version":"< 3.2.1","status":"affected"}]}],"references":["https://github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c","https://github.com/sigstore/sigstore-js/pull/1657","https://github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7","https://github.com/sigstore/sigstore-js/releases/tag/%40sigstore%2Fcore%403.2.1"],"weaknesses":["CWE-347"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/48xxx/CVE-2026-48758.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-48758","state":"PUBLISHED","datePublished":"2026-07-14T20:36:28.641Z","dateUpdated":"2026-07-15T12:54:55.445Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-22T19:39:05.356Z"},"containers":{"cna":{"title":"sigstore-js: DSSE payloadType type-binding failure","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"sigstore","product":"sigstore-js","versions":[{"version":"< 3.2.1","status":"affected"}]}],"references":[{"url":"https://github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c","name":"https://github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/sigstore/sigstore-js/pull/1657","name":"https://github.com/sigstore/sigstore-js/pull/1657","tags":["x_refsource_MISC"]},{"url":"https://github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7","name":"https://github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7","tags":["x_refsource_MISC"]},{"url":"https://github.com/sigstore/sigstore-js/releases/tag/%40sigstore%2Fcore%403.2.1","name":"https://github.com/sigstore/sigstore-js/releases/tag/%40sigstore%2Fcore%403.2.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-347","lang":"en","description":"CWE-347: Improper Verification of Cryptographic Signature","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-14T20:36:28.641Z"},"source":{"advisory":"GHSA-jfc7-64v2-mr8c","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-15T12:54:43.124124Z","id":"CVE-2026-48758","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-15T12:54:55.445Z"}}]}}}