{"id":"CVE-2026-42462","state":"PUBLISHED","title":"Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring","description":"Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its Linked Data Signature, allowing them to alter a third-party signed activity they have received. Versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3 fix the issue.","publishedAt":"2026-06-10T20:22:35.383Z","updatedAt":"2026-06-11T13:34:03.443Z","severity":{"score":7,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["fedify-dev fedify"],"affected":[{"vendor":"fedify-dev","product":"fedify","versions":[{"version":">= 2.2.0, < 2.2.3","status":"affected"},{"version":">= 2.1.0, < 2.1.14","status":"affected"},{"version":">= 2.0.0, < 2.0.18","status":"affected"},{"version":">= 1.10.0, < 1.10.10","status":"affected"},{"version":"< 1.9.11","status":"affected"}]}],"references":["https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367","https://github.com/fedify-dev/fedify/releases/tag/2.2.3"],"weaknesses":["CWE-180","CWE-347","CWE-436","CWE-1289"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/42xxx/CVE-2026-42462.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-42462","state":"PUBLISHED","datePublished":"2026-06-10T20:22:35.383Z","dateUpdated":"2026-06-11T13:34:03.443Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-27T13:55:58.694Z"},"containers":{"cna":{"title":"Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring","descriptions":[{"lang":"en","value":"Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Prior to versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3, an attacker can make use of JSON-LD features to restructure a JSON-LD document that would change how Fedify interprets it without changing its Linked Data Signature, allowing them to alter a third-party signed activity they have received. Versions 1.9.11, 1.10.10, 2.0.18, 2.1.14, and 2.2.3 fix the issue."}],"affected":[{"vendor":"fedify-dev","product":"fedify","versions":[{"version":">= 2.2.0, < 2.2.3","status":"affected"},{"version":">= 2.1.0, < 2.1.14","status":"affected"},{"version":">= 2.0.0, < 2.0.18","status":"affected"},{"version":">= 1.10.0, < 1.10.10","status":"affected"},{"version":"< 1.9.11","status":"affected"}]}],"references":[{"url":"https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367","name":"https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/fedify-dev/fedify/releases/tag/2.2.3","name":"https://github.com/fedify-dev/fedify/releases/tag/2.2.3","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-180","lang":"en","description":"CWE-180: Incorrect Behavior Order: Validate Before Canonicalize","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-347","lang":"en","description":"CWE-347: Improper Verification of Cryptographic Signature","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-436","lang":"en","description":"CWE-436: Interpretation Conflict","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-1289","lang":"en","description":"CWE-1289: Improper Validation of Unsafe Equivalence in Input","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-10T20:22:35.383Z"},"source":{"advisory":"GHSA-9rfg-v8g9-9367","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-11T13:31:40.827057Z","id":"CVE-2026-42462","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-11T13:34:03.443Z"}}]}}}