{"answers":{"affected":"2 open source packages ship an affected version, including @fastify/busboy. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-19481 in the wild and no public exploit code.","fix":"Upgrade @fastify/busboy to 3.2.1 or later.","what":"CVE-2026-19481 is a high-severity denial of service vulnerability in @fastify/busboy, published on 13 Aug 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-2026-19481 and fix it if it is affected.\n\nWhat it is: CVE-2026-19481 is a high-severity denial of service vulnerability in @fastify/busboy, published on 13 Aug 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-2026-19481 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- @fastify/busboy (npm): affected from 1.0.0; fixed in 3.2.1\n- @fastify/busboy (npm): affected from 1.0.0; fixed in 3.2.1\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-2026-19481/ (Markdown: https://insights.sbomify.com/CVE-2026-19481/index.md)","id":"CVE-2026-19481","markdown":"https://insights.sbomify.com/CVE-2026-19481/index.md","name":"CVE-2026-19481","record":{"aliases":["GHSA-x8mw-p69m-v3mx","MINI-vrm5-m8v6-vxxr","ROOT-APP-NPM-CVE-2026-19481"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js multipart parser","requires_auth":"none","summary":"An attacker can crash the Node.js process by sending multipart headers with prototype names, causing denial of service in applications using this parser.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"openjs","cpe":[{"product":"fastify\\/busyboy","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:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-754","name":"Improper Check for Unusual or Exceptional Conditions"}],"description":"@fastify/busboy is a multipart form-data parser. In versions 1.0.0 through 3.2.0, an attacker who can submit multipart form-data can crash the parser by sending a part header whose name is a prototype-inherited property such as __proto__ or constructor. The internal header parser stores headers in a plain JavaScript object and assumes each value is an array, so an inherited property name resolves to a truthy non-array value and triggers a TypeError. In the common pipe integration the failure surfaces as an error event, but in direct write or end usage the exception is thrown synchronously and can terminate the Node.js process, causing an unauthenticated denial of service. The issue is fixed in @fastify/busboy 3.2.1, which creates the header object with a null prototype. Users should upgrade to 3.2.1.","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/busboy vulnerable to Denial of Service via prototype-named multipart part header","id":"CVE-2026-19481","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":2,"n_references":2,"next":{"headline":"Security vulnerabilities have been found in IBM Verify Identity Access and IBM Security Verify Access","id":"CVE-2026-19482"},"packages":[{"ecosystem":"npm","fixed":["3.2.1"],"introduced":["1.0.0"],"last_affected":[],"package":"@fastify/busboy","purl":null,"source":"GHSA-x8mw-p69m-v3mx"},{"ecosystem":"npm","fixed":["3.2.1"],"introduced":["1.0.0"],"last_affected":[],"package":"@fastify/busboy","purl":"pkg:npm/%40fastify/busboy","source":"GHSA-x8mw-p69m-v3mx"}],"prev":{"headline":"CAI Content Credentials | Improper Input Validation (CWE-20)","id":"CVE-2026-19480"},"products":["@fastify/busboy"],"published":"2026-08-13","related":[{"cvss_score":7.5,"headline":"@fastify/busboy vulnerable to Denial of Service via oversized multipart boundary","id":"CVE-2026-19484","kev_date_added":null,"published":"2026-08-13"},{"cvss_score":5.8,"headline":"@fastify/busboy vulnerable to CRLF injection via multipart Content-Disposition filename and name","id":"CVE-2026-74866","kev_date_added":null,"published":"2026-08-21"}],"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":"2026-08-13","vendors":["@fastify/busboy"]},"summary":"An attacker can crash the Node.js process by sending multipart headers with prototype names, causing denial of service in applications using this parser.","url":"https://insights.sbomify.com/CVE-2026-19481/"}