{"id":"CVE-2026-42462","summary":"Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring","details":"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.","aliases":["GHSA-9rfg-v8g9-9367"],"modified":"2026-07-08T08:12:34.796591954Z","published":"2026-06-10T20:22:35.383Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42462.json","cwe_ids":["CWE-1289","CWE-180","CWE-347","CWE-436"],"cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/fedify-dev/fedify/releases/tag/2.2.3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42462.json"},{"type":"ADVISORY","url":"https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42462"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/fedify-dev/fedify","events":[{"introduced":"7c1bc8ab6e7f70c54fde4be3372dcd113f3f7947"},{"introduced":"49bfb3679ceaf3c20e4029033d19aed6f5cd9d0c"},{"introduced":"9568bcde77d3f1df90e2a790f5ff81b5bc787c5d"},{"introduced":"e4277717b0cad40c6282aae3dd14d4016cda45af"},{"introduced":"0"},{"fixed":"8140088d6572fde6442b31902f1648b3afcc6bcd"},{"fixed":"5a5802e75da8e217173709cb15657b975b725c90"},{"fixed":"2af7014cfb1d4293bf886c4d19bccbe709c7ee64"},{"fixed":"5e2cf795090aa9db925160c034a08973bcf0d925"},{"fixed":"d61de18b49be5376385637bafd38c417a30ad255"}],"database_specific":{"extracted_events":[{"introduced":"2.2.0"},{"fixed":"2.2.3"},{"introduced":"2.1.0"},{"fixed":"2.1.14"},{"introduced":"2.0.0"},{"fixed":"2.0.18"},{"introduced":"1.10.0"},{"fixed":"1.10.10"},{"introduced":"0"},{"fixed":"1.9.11"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["2.2.2","2.1.13","2.0.17","2.2.1","2.1.12","2.0.16","1.10.9","1.9.10","2.2.0","2.1.11","2.0.15","2.1.10","2.0.14","2.1.9","2.1.8","2.0.13","2.1.7","2.1.6","2.1.5","1.10.8","2.0.12","1.9.9","2.1.4","2.0.11","1.10.7","1.9.8","2.1.3","2.0.10","2.1.2","2.0.9","1.10.6","1.9.7","2.1.1","2.0.8","1.10.5","1.9.6","2.1.0","2.0.7","2.0.6","2.0.5","1.10.4","2.0.4","2.0.3","2.0.2","2.0.1","2.0.0","1.10.3","1.9.5","1.10.2","1.9.4","1.10.1","1.9.3","1.10.0","1.9.2","1.9.1","1.9.0","1.8.1","1.7.0","1.6.1","1.5.0","1.4.0","1.3.0","1.2.0","1.1.0","1.0.0","0.15.0","0.14.0","0.13.0","0.12.0","0.11.0","0.10.0","0.9.0","0.8.0","0.7.0","0.6.0","0.5.0","0.4.0","0.3.0","0.2.0","0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42462.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L"}]}