{"answers":{"affected":"2 open source packages ship an affected version, including fastify. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-84469 in the wild and no public exploit code.","fix":"Upgrade fastify to 5.12.2 or later.","what":"CVE-2026-84469 is a high-severity vulnerability in fastify, published on 4 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-2026-84469 and fix it if it is affected.\n\nWhat it is: CVE-2026-84469 is a high-severity vulnerability in fastify, published on 4 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-2026-84469 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- fastify (npm): affected all versions; fixed in 5.12.2\n- fastify (npm): affected all versions; fixed in 5.12.2\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-2026-84469/ (Markdown: https://insights.sbomify.com/CVE-2026-84469/index.md)","id":"CVE-2026-84469","markdown":"https://insights.sbomify.com/CVE-2026-84469/index.md","name":"CVE-2026-84469","record":{"aliases":["CLSA-2026-1791667225","GHSA-hwr6-493r-vm6h","MINI-82m3-26hw-q684"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js web framework","requires_auth":"none","summary":"Attackers can bypass request validation in Fastify by exploiting a truthiness bug, allowing unauthorized access to handlers intended to be disabled.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"openjs","cpe":[{"product":"fastify","vendor":"fastify"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"}],"description":"fastify versions before 5.12.2 decide whether to compile a request schema based on JavaScript truthiness, but JSON Schema Draft 7 defines the boolean false as a valid schema that rejects every instance. When an application assigns false to a route's body, querystring, params, or headers schema to deny all input, fastify treats it as a missing schema, compiles no validator, and runs the route handler on any request. An unauthenticated remote client can therefore reach a handler that a valid deny-all schema was intended to make unreachable, a complete validation bypass that can lead to unauthorized state changes or execution of disabled operations. Users should upgrade to fastify 5.12.2 or later.","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":"fastify vulnerable to request validation bypass via skipped boolean false schemas","id":"CVE-2026-84469","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":2,"n_references":2,"next":{"headline":"Missing authorization in Red Hat Ansible Automation Platform 2.5 for RHEL 8","id":"CVE-2026-84470"},"packages":[{"ecosystem":"npm","fixed":["5.12.2"],"introduced":["0"],"last_affected":[],"package":"fastify","purl":null,"source":"GHSA-hwr6-493r-vm6h"},{"ecosystem":"npm","fixed":["5.12.2"],"introduced":["0"],"last_affected":[],"package":"fastify","purl":"pkg:npm/fastify","source":"GHSA-hwr6-493r-vm6h"}],"prev":{"headline":"Zammad: S/MIME signature verification allows forged sender impersonation","id":"CVE-2026-84465"},"products":["fastify"],"published":"2026-09-04","related":[{"cvss_score":8.1,"headline":"fastify vulnerable to request body replacement via an async validation result collision","id":"CVE-2026-84504","kev_date_added":null,"published":"2026-09-04"},{"cvss_score":7.5,"headline":"fastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers","id":"CVE-2026-76169","kev_date_added":null,"published":"2026-09-04"},{"cvss_score":7.5,"headline":"fastify vulnerable to header validation bypass via incomplete schema case normalization","id":"CVE-2026-84428","kev_date_added":null,"published":"2026-09-04"},{"cvss_score":7.5,"headline":"fastify vulnerable to Body Schema Validation Bypass via Leading Space in Content-Type Header","id":"CVE-2026-33806","kev_date_added":null,"published":"2026-04-15"},{"cvss_score":7.5,"headline":"Fastify's Content-Type header tab character allows body validation bypass","id":"CVE-2026-25223","kev_date_added":null,"published":"2026-02-03"},{"cvss_score":7.5,"headline":"Fastify vulnerable to invalid content-type parsing, which could lead to validation bypass","id":"CVE-2025-32442","kev_date_added":null,"published":"2025-04-18"}],"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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-04","vendors":["fastify"]},"summary":"Attackers can bypass request validation in Fastify by exploiting a truthiness bug, allowing unauthorized access to handlers intended to be disabled.","url":"https://insights.sbomify.com/CVE-2026-84469/"}