{"answers":{"affected":"2 open source packages ship an affected version, including multiparty. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-8159 in the wild and no public exploit code.","fix":"Upgrade multiparty to 4.3.0 or later.","what":"CVE-2026-8159 is a high-severity denial of service vulnerability in multiparty, published on 12 May 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-2026-8159 and fix it if it is affected.\n\nWhat it is: CVE-2026-8159 is a high-severity denial of service vulnerability in multiparty, published on 12 May 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-2026-8159 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- multiparty (npm): affected all versions; fixed in 4.3.0\n- multiparty (npm): affected all versions; fixed in 4.3.0\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-2026-8159/ (Markdown: https://insights.sbomify.com/CVE-2026-8159/index.md)","id":"CVE-2026-8159","markdown":"https://insights.sbomify.com/CVE-2026-8159/index.md","name":"CVE-2026-8159","record":{"aliases":["CLSA-2026-1785291243","DEBIAN-CVE-2026-8159","GHSA-65x3-rw7q-gx94","ROOT-APP-NPM-CVE-2026-8159","UBUNTU-CVE-2026-8159"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js multipart library","requires_auth":"none","summary":"Attackers can cause denial of service in Node.js applications using multiparty by sending crafted multipart uploads that trigger regex backtracking.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"openjs","cpe":[{"product":"multiparty","vendor":"pillarjs"}],"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-1333","name":"Inefficient Regular Expression Complexity"}],"description":"multiparty@4.2.3 and lower versions are vulnerable to denial of service via regular expression backtracking in the Content-Disposition filename parameter parser. A crafted multipart upload with a long header value can cause regex matching to take seconds, blocking the event loop. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: limiting upload sizes at the proxy or gateway layer reduces but does not eliminate the attack surface, since a small header of around 8 KB is sufficient to trigger the vulnerable backtracking. Upgrade to multiparty@4.3.0 or higher.","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":"multiparty vulnerable to ReDoS via filename parsing","id":"CVE-2026-8159","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"multiparty vulnerable to Denial of Service via Prototype Pollution leading to Uncaught Exception","id":"CVE-2026-8161"},"packages":[{"ecosystem":"npm","fixed":["4.3.0"],"introduced":["0"],"last_affected":[],"package":"multiparty","purl":null,"source":"GHSA-65x3-rw7q-gx94"},{"ecosystem":"npm","fixed":["4.3.0"],"introduced":["0"],"last_affected":[],"package":"multiparty","purl":"pkg:npm/multiparty","source":"GHSA-65x3-rw7q-gx94"}],"prev":{"headline":"Memory corruption in Axis File Player","id":"CVE-2026-8158"},"products":["multiparty"],"published":"2026-05-12","related":[{"cvss_score":7.5,"headline":"multiparty vulnerable to Denial of Service via Prototype Pollution leading to Uncaught Exception","id":"CVE-2026-8161","kev_date_added":null,"published":"2026-05-12"},{"cvss_score":7.5,"headline":"multiparty vulnerable to Denial of Service via Uncaught Exception in filename* parameter parsing","id":"CVE-2026-8162","kev_date_added":null,"published":"2026-05-12"}],"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":"2026-05-12","vendors":["multiparty"]},"summary":"Attackers can cause denial of service in Node.js applications using multiparty by sending crafted multipart uploads that trigger regex backtracking.","url":"https://insights.sbomify.com/CVE-2026-8159/"}