{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42462", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-27T13:55:58.694Z", "datePublished": "2026-06-10T20:22:35.383Z", "dateUpdated": "2026-06-11T13:34:03.443Z"}, "containers": {"cna": {"title": "Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring", "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"}]}], "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"}}], "references": [{"name": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367"}, {"name": "https://github.com/fedify-dev/fedify/releases/tag/2.2.3", "tags": ["x_refsource_MISC"], "url": "https://github.com/fedify-dev/fedify/releases/tag/2.2.3"}], "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"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-10T20:22:35.383Z"}, "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."}], "source": {"advisory": "GHSA-9rfg-v8g9-9367", "discovery": "UNKNOWN"}}, "adp": [{"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"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-11T13:34:03.443Z"}}]}}

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{"cveTags": [], "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."}], "id": "CVE-2026-42462", "lastModified": "2026-06-11T15:34:28.757", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 7.0, "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"}, "exploitabilityScore": 2.2, "impactScore": 4.7, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-06-10T22:16:57.387", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/fedify-dev/fedify/releases/tag/2.2.3"}, {"source": "security-advisories@github.com", "url": "https://github.com/fedify-dev/fedify/security/advisories/GHSA-9rfg-v8g9-9367"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-180"}, {"lang": "en", "value": "CWE-347"}, {"lang": "en", "value": "CWE-436"}, {"lang": "en", "value": "CWE-1289"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.2.0,2.2.3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.1.0,2.1.14)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.0.0,2.0.18)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.10.0,1.10.10)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.9.11)"}}], "enrichment": {"confidence": 87.0, "confidence_source": "matching", "scores": [{"score": 87.0, "source": "matching"}]}, "original": {"product": "fedify", "source": "cna", "vendor": "fedify-dev"}, "product": "fedify", "vendor": "fedify"}], "created": "2026-06-10T23:00:20.871042+00:00", "updated": "2026-06-11T10:30:11.842186+00:00", "vendors": ["fedify", "fedify$PRODUCT$fedify"]}