{"answers":{"affected":"2 open source packages ship an affected version, including @fastify/middie. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-22031 exists.","fix":"Upgrade @fastify/middie to 9.1.0 or later.","what":"CVE-2026-22031 is a high-severity vulnerability in fastify middie, published on 19 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-22031 and fix it if it is affected.\n\nWhat it is: CVE-2026-22031 is a high-severity vulnerability in fastify middie, published on 19 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-22031 exists.\n\nAffected packages and fixed versions:\n- @fastify/middie (npm): affected all versions; fixed in 9.1.0\n- @fastify/middie (npm): affected all versions; fixed in 9.1.0\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-2026-22031/ (Markdown: https://insights.sbomify.com/CVE-2026-22031/index.md)","id":"CVE-2026-22031","markdown":"https://insights.sbomify.com/CVE-2026-22031/index.md","name":"CVE-2026-22031","record":{"aliases":["GHSA-cxrg-g7r8-w69p"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Fastify middleware plugin","requires_auth":"low_privilege","summary":"Attackers can bypass middleware security checks on protected endpoints by using URL-encoded characters in the request path.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"fastify\\/middie","vendor":"fastify"}],"cvss":{"score":8.4,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L","version":"3.1"},"cwes":[{"id":"CWE-177","name":"Improper Handling of URL Encoding (Hex Encoding)"}],"description":"@fastify/middie is the plugin that adds middleware support on steroids to Fastify. A security vulnerability exists in @fastify/middie prior to version 9.1.0 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters (e.g., `/%61dmin` instead of `/admin`). While the middleware engine fails to match the encoded path and skips execution, the underlying Fastify router correctly decodes the path and matches the route handler, allowing attackers to access protected endpoints without the middleware constraints. Version 9.1.0 fixes the issue.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Fastify Middie Middleware Path Bypass","id":"CVE-2026-22031","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":2,"n_references":4,"next":{"headline":"Directus has open redirect in SAML","id":"CVE-2026-22032"},"packages":[{"ecosystem":"npm","fixed":["9.1.0"],"introduced":["0"],"last_affected":[],"package":"@fastify/middie","purl":null,"source":"GHSA-cxrg-g7r8-w69p"},{"ecosystem":"npm","fixed":["9.1.0"],"introduced":["0"],"last_affected":[],"package":"@fastify/middie","purl":"pkg:npm/%40fastify/middie","source":"GHSA-cxrg-g7r8-w69p"}],"prev":{"headline":"React Router has CSRF issue in Action/Server Action Request Processing","id":"CVE-2026-22030"},"products":["middie"],"published":"2026-01-19","related":[{"cvss_score":9.1,"headline":"@fastify/middie vulnerable to path-scoped middleware bypass via absolute-form request target","id":"CVE-2026-85184","kev_date_added":null,"published":"2026-09-04"},{"cvss_score":9.1,"headline":"@fastify/middie vulnerable to authorization bypass via encoded slash in path parameter values","id":"CVE-2026-14198","kev_date_added":null,"published":"2026-07-01"},{"cvss_score":9.1,"headline":"@fastify/middie vulnerable to middleware authentication bypass in child plugin scopes","id":"CVE-2026-6270","kev_date_added":null,"published":"2026-04-16"},{"cvss_score":8.2,"headline":"@fastify/middie has an improper path normalization vulnerability","id":"CVE-2026-2880","kev_date_added":null,"published":"2026-02-27"},{"cvss_score":7.5,"headline":"@fastify/middie standalone engine vulnerable to Denial of Service via malformed percent-encoded paths","id":"CVE-2026-14181","kev_date_added":null,"published":"2026-07-01"},{"cvss_score":7.4,"headline":"@fastify/middie vulnerable to middleware bypass via deprecated ignoreDuplicateSlashes option","id":"CVE-2026-33804","kev_date_added":null,"published":"2026-04-16"}],"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":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-01-20","vendors":["fastify"]},"summary":"Attackers can bypass middleware security checks on protected endpoints by using URL-encoded characters in the request path.","url":"https://insights.sbomify.com/CVE-2026-22031/"}