{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-120214 in the wild and no public exploit code.","exposure":"","fix":"No fix has been published for CVE-2026-120214 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-120214 is a medium-severity vulnerability in @fastify/http-proxy, published on 2 Nov 2026."},"fix_prompt":"Check this codebase for CVE-2026-120214 and fix it if it is affected.\n\nWhat it is: CVE-2026-120214 is a medium-severity vulnerability in @fastify/http-proxy, published on 2 Nov 2026. \nExploitation: There is no known exploitation of CVE-2026-120214 in the wild and no public exploit code.\n\nAffected product: @fastify/http-proxy. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-120214/ (Markdown: https://insights.sbomify.com/CVE-2026-120214/index.md)","id":"CVE-2026-120214","markdown":"https://insights.sbomify.com/CVE-2026-120214/index.md","name":"CVE-2026-120214","record":{"aliases":["GHSA-hr26-gmr2-pwcv"],"analysis":null,"analysis_generated_by":null,"assigner":"openjs","cpe":[],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"@fastify/http-proxy is a Fastify plugin that proxies HTTP requests to an upstream server under a configured prefix. In versions 11.6.0 through 11.6.2, the destination validation normalizes literal backslashes before it percent-decodes the request path, so a path that encodes its backslashes and dot-segments survives the dot-segment check and is only turned into backslash and double-dot sequences after that check has passed. When the upstream resolves on a platform that treats a backslash as a path separator, the forwarded request walks out of the configured proxy prefix and reaches a sibling location on the upstream. An unauthenticated remote attacker can use this to retrieve upstream resources outside the intended prefix, so the impact is confidentiality only, and exploitation depends on the upstream's path handling. The issue is fixed in @fastify/http-proxy 11.6.3, and users should upgrade to 11.6.3 or later. This is a follow-up to the earlier prefix-escape fix, which did not account for the encoded-backslash form.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"@fastify/http-proxy vulnerable to prefix escape via percent-encoded backslash dot-segments","id":"CVE-2026-120214","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"@fastify/cors vulnerable to Denial of Service on a CORS preflight with the onSend hook","id":"CVE-2026-120215"},"nickname":null,"packages":[],"prev":{"headline":"@fastify/http-proxy vulnerable to prefix escape via decoded route parameters","id":"CVE-2026-120213"},"products":["@fastify/http-proxy"],"published":"2026-11-02","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-11-02","vendors":["@fastify/http-proxy"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-120214/"}