{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-120213 in the wild and no public exploit code.","exposure":"","fix":"No fix has been published for CVE-2026-120213 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-120213 is a critical vulnerability in @fastify/http-proxy, published on 2 Nov 2026."},"fix_prompt":"Check this codebase for CVE-2026-120213 and fix it if it is affected.\n\nWhat it is: CVE-2026-120213 is a critical vulnerability in @fastify/http-proxy, published on 2 Nov 2026. \nExploitation: There is no known exploitation of CVE-2026-120213 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-2026-120213/ (Markdown: https://insights.sbomify.com/CVE-2026-120213/index.md)","id":"CVE-2026-120213","markdown":"https://insights.sbomify.com/CVE-2026-120213/index.md","name":"CVE-2026-120213","record":{"aliases":["GHSA-h3vp-4jfr-v364"],"analysis":null,"analysis_generated_by":null,"assigner":"openjs","cpe":[],"cvss":{"score":9.1,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-436","name":"Interpretation Conflict"},{"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 9.0.0 through 11.6.5, when an application uses parameterized prefix and rewritePrefix options to pin clients to a fixed upstream path, the plugin substitutes URL-decoded route parameters into rewritePrefix without re-encoding them. A parameter value that encodes a path separator together with a fragment or query delimiter therefore decodes into real separators and delimiters that inject extra upstream path segments and strip the mandatory suffix the rewritePrefix was meant to enforce, without using any dot-dot traversal. An unauthenticated remote attacker can use this to reach upstream locations outside the intended prefix, leading to path-restriction bypass and, depending on the upstream, server-side request forgery or authorization bypass in the proxied service. The issue is fixed in @fastify/http-proxy 11.6.6, and users should upgrade to 11.6.6 or later. There is no workaround other than upgrading.","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 decoded route parameters","id":"CVE-2026-120213","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/http-proxy vulnerable to prefix escape via percent-encoded backslash dot-segments","id":"CVE-2026-120214"},"nickname":null,"packages":[],"prev":{"headline":"Web::Simple versions before 0.037 for Perl do not escape single quotes in HTML::Tags output","id":"CVE-2026-120212"},"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":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-11-02","vendors":["@fastify/http-proxy"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-120213/"}