{"answers":{"affected":"10 open source packages ship an affected version, including @fedify/fedify.","exploited":"There is no known exploitation of CVE-2026-42462 in the wild and no public exploit code.","fix":"Upgrade @fedify/fedify to a fixed version for your release line: 1.9.11, 1.10.10, 2.0.18 or 2.1.14.","what":"CVE-2026-42462 is a high-severity vulnerability in fedify-dev fedify, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-42462 and fix it if it is affected.\n\nWhat it is: CVE-2026-42462 is a high-severity vulnerability in fedify-dev fedify, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-42462 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- @fedify/fedify (npm): affected all versions; fixed in 1.9.11\n- @fedify/fedify (npm): affected all versions; fixed in 1.9.11\n- @fedify/fedify (npm): affected from 1.10.0; fixed in 1.10.10\n- @fedify/fedify (npm): affected from 1.10.0; fixed in 1.10.10\n- @fedify/fedify (npm): affected from 2.0.0; fixed in 2.0.18\n- @fedify/fedify (npm): affected from 2.0.0; fixed in 2.0.18\n- @fedify/fedify (npm): affected from 2.1.0; fixed in 2.1.14\n- @fedify/fedify (npm): affected from 2.1.0; fixed in 2.1.14\n- @fedify/fedify (npm): affected from 2.2.0; fixed in 2.2.3\n- @fedify/fedify (npm): affected from 2.2.0; fixed in 2.2.3\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-42462/ (Markdown: https://insights.sbomify.com/CVE-2026-42462/index.md)","id":"CVE-2026-42462","markdown":"https://insights.sbomify.com/CVE-2026-42462/index.md","name":"CVE-2026-42462","record":{"aliases":["GHSA-9rfg-v8g9-9367"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"ActivityPub TypeScript library","requires_auth":"none","summary":"Attackers can bypass LD-Signature verification in Fedify by restructuring JSON-LD documents, allowing them to alter signed activities.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L","version":"3.1"},"cwes":[{"id":"CWE-180","name":"Incorrect Behavior Order: Validate Before Canonicalize"},{"id":"CWE-436","name":"Interpretation Conflict"},{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature"},{"id":"CWE-1289","name":"Improper Validation of Unsafe Equivalence in Input"}],"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.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Fedify has an LD-Signature Bypass via JSON-LD Named-Graph Restructuring","id":"CVE-2026-42462","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":10,"n_references":2,"next":{"headline":"SQLBot: Unauthorized Access Vulnerability","id":"CVE-2026-42463"},"packages":[{"ecosystem":"npm","fixed":["1.9.11"],"introduced":["0"],"last_affected":[],"package":"@fedify/fedify","purl":null,"source":"GHSA-9rfg-v8g9-9367"},{"ecosystem":"npm","fixed":["1.9.11"],"introduced":["0"],"last_affected":[],"package":"@fedify/fedify","purl":"pkg:npm/%40fedify/fedify","source":"GHSA-9rfg-v8g9-9367"},{"ecosystem":"npm","fixed":["1.10.10"],"introduced":["1.10.0"],"last_affected":[],"package":"@fedify/fedify","purl":null,"source":"GHSA-9rfg-v8g9-9367"},{"ecosystem":"npm","fixed":["1.10.10"],"introduced":["1.10.0"],"last_affected":[],"package":"@fedify/fedify","purl":"pkg:npm/%40fedify/fedify","source":"GHSA-9rfg-v8g9-9367"},{"ecosystem":"npm","fixed":["2.0.18"],"introduced":["2.0.0"],"last_affected":[],"package":"@fedify/fedify","purl":null,"source":"GHSA-9rfg-v8g9-9367"},{"ecosystem":"npm","fixed":["2.0.18"],"introduced":["2.0.0"],"last_affected":[],"package":"@fedify/fedify","purl":"pkg:npm/%40fedify/fedify","source":"GHSA-9rfg-v8g9-9367"},{"ecosystem":"npm","fixed":["2.1.14"],"introduced":["2.1.0"],"last_affected":[],"package":"@fedify/fedify","purl":null,"source":"GHSA-9rfg-v8g9-9367"},{"ecosystem":"npm","fixed":["2.1.14"],"introduced":["2.1.0"],"last_affected":[],"package":"@fedify/fedify","purl":"pkg:npm/%40fedify/fedify","source":"GHSA-9rfg-v8g9-9367"},{"ecosystem":"npm","fixed":["2.2.3"],"introduced":["2.2.0"],"last_affected":[],"package":"@fedify/fedify","purl":null,"source":"GHSA-9rfg-v8g9-9367"},{"ecosystem":"npm","fixed":["2.2.3"],"introduced":["2.2.0"],"last_affected":[],"package":"@fedify/fedify","purl":"pkg:npm/%40fedify/fedify","source":"GHSA-9rfg-v8g9-9367"}],"prev":{"headline":"Arcane Vulnerable to Unauthenticated Disclosure of Custom Compose Template Content (incl. `.env` secrets)","id":"CVE-2026-42461"},"products":["fedify"],"published":"2026-06-10","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-11","vendors":["fedify-dev"]},"summary":"Attackers can bypass LD-Signature verification in Fedify by restructuring JSON-LD documents, allowing them to alter signed activities.","url":"https://insights.sbomify.com/CVE-2026-42462/"}