{"answers":{"affected":"4 open source packages ship an affected version, including h3.","exploited":"There is no known exploitation of CVE-2026-86253 in the wild and no public exploit code.","fix":"Upgrade h3 to a fixed version for your release line: 1.15.6 or 2.0.1-rc.15.","what":"CVE-2026-86253 is a high-severity path traversal vulnerability in h3js h3, published on 6 Sep 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-2026-86253 and fix it if it is affected.\n\nWhat it is: CVE-2026-86253 is a high-severity path traversal vulnerability in h3js h3, published on 6 Sep 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-2026-86253 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- h3 (npm): affected all versions; fixed in 1.15.6\n- h3 (npm): affected all versions; fixed in 1.15.6\n- h3 (npm): affected from 2.0.0; fixed in 2.0.1-rc.15\n- h3 (npm): affected from 2.0.0; fixed in 2.0.1-rc.15\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-2026-86253/ (Markdown: https://insights.sbomify.com/CVE-2026-86253/index.md)","id":"CVE-2026-86253","markdown":"https://insights.sbomify.com/CVE-2026-86253/index.md","name":"CVE-2026-86253","record":{"aliases":["CLSA-2026-1792233034","GHSA-jh84-7pcc-38gf","GHSA-wr4h-v87w-p3r7"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js HTTP library","requires_auth":"none","summary":"An unauthenticated remote attacker can read arbitrary files outside the intended static directory via crafted requests in the h3 library.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"h3 (npm package) versions \u003c= 2.0.1-rc.14 contain a path traversal vulnerability in serveStatic(). On Node.js deployments, event.url.pathname is not normalized, so percent-encoded dot segments (%2e%2e) are passed to decodeURI() and decoded to ../ sequences without sanitization. An unauthenticated remote attacker can send crafted requests to endpoints served by serveStatic() to read arbitrary files outside the intended static directory. Fixed in 1.15.6 and 2.0.1-rc.15.","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":"h3 before 1.15.6 Path Traversal via Percent-Encoded Dot Segments","id":"CVE-2026-86253","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"path_traversal","year":"2026"},"n_packages":4,"n_references":2,"next":{"headline":"wger Incomplete Authorization Fix Cross-Tenant Account Deletion","id":"CVE-2026-86254"},"packages":[{"ecosystem":"npm","fixed":["1.15.6"],"introduced":["0"],"last_affected":[],"package":"h3","purl":null,"source":"GHSA-wr4h-v87w-p3r7"},{"ecosystem":"npm","fixed":["1.15.6"],"introduced":["0"],"last_affected":[],"package":"h3","purl":"pkg:npm/h3","source":"GHSA-wr4h-v87w-p3r7"},{"ecosystem":"npm","fixed":["2.0.1-rc.15"],"introduced":["2.0.0"],"last_affected":[],"package":"h3","purl":null,"source":"GHSA-wr4h-v87w-p3r7"},{"ecosystem":"npm","fixed":["2.0.1-rc.15"],"introduced":["2.0.0"],"last_affected":[],"package":"h3","purl":"pkg:npm/h3","source":"GHSA-wr4h-v87w-p3r7"}],"prev":{"headline":"h3 before 1.15.9 SSE Event Injection via Carriage Return","id":"CVE-2026-86252"},"products":["h3"],"published":"2026-09-06","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":"2026-09-10","vendors":["h3js"]},"summary":"An unauthenticated remote attacker can read arbitrary files outside the intended static directory via crafted requests in the h3 library.","url":"https://insights.sbomify.com/CVE-2026-86253/"}