{"answers":{"affected":"2 open source packages ship an affected version, including multer. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-77037 in the wild and no public exploit code.","fix":"Upgrade multer to 2.3.0 or later.","what":"CVE-2026-77037 is a high-severity denial of service vulnerability in multer, published on 28 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-2026-77037 and fix it if it is affected.\n\nWhat it is: CVE-2026-77037 is a high-severity denial of service vulnerability in multer, published on 28 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-2026-77037 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- multer (npm): affected from 2.2.0; fixed in 2.3.0\n- multer (npm): affected from 2.2.0; fixed in 2.3.0\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-2026-77037/ (Markdown: https://insights.sbomify.com/CVE-2026-77037/index.md)","id":"CVE-2026-77037","markdown":"https://insights.sbomify.com/CVE-2026-77037/index.md","name":"CVE-2026-77037","record":{"aliases":["CLEANSTART-2026-FL31230","ECHO-65aa-dfa0-c380","GHSA-qfvm-cv95-jqjf","MINI-3jg4-mcf8-7wm3","MINI-63c9-mv84-4vcf","MINI-q3rr-c25j-h586","ROOT-APP-NPM-CVE-2026-77037"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js multipart middleware","requires_auth":"none","summary":"Remote attackers can cause denial of service by leaking file descriptors through aborted uploads in the multer Node.js library.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"openjs","cpe":[{"product":"multer","vendor":"expressjs"}],"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-459","name":"Incomplete Cleanup"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"multer is a middleware for handling multipart/form-data in Node.js. In version 2.2.0, when a disk-backed upload is aborted or truncated before the write stream finishes, multer's disk storage engine removes the visible file but does not close the underlying write file descriptor, leaving a deleted but still open descriptor. A remote attacker able to reach an upload route using the built-in disk storage can send repeated aborted or malformed multipart uploads, each one leaking a file descriptor and retaining disk blocks until the process exits, which can exhaust resources and cause a denial of service. The issue is fixed in multer 2.3.0, which closes the destination write stream on abnormal source termination and defers cleanup until the stream has closed. Upgrade to multer 2.3.0 to remediate.","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":"multer vulnerable to Denial of Service via file descriptor leak on aborted uploads","id":"CVE-2026-77037","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":"Potential denial-of-service vulnerability in get_supported_language_variant()","id":"CVE-2026-77050"},"packages":[{"ecosystem":"npm","fixed":["2.3.0"],"introduced":["2.2.0"],"last_affected":[],"package":"multer","purl":null,"source":"GHSA-qfvm-cv95-jqjf"},{"ecosystem":"npm","fixed":["2.3.0"],"introduced":["2.2.0"],"last_affected":[],"package":"multer","purl":"pkg:npm/multer","source":"GHSA-qfvm-cv95-jqjf"}],"prev":{"headline":"elunez eladmin GenConfigController improper authorization","id":"CVE-2026-77036"},"products":["multer"],"published":"2026-08-28","related":[{"cvss_score":8.7,"headline":"Multer vulnerable to Denial of Service via uncontrolled recursion","id":"CVE-2026-3520","kev_date_added":null,"published":"2026-03-04"},{"cvss_score":8.7,"headline":"Multer vulnerable to Denial of Service via resource exhaustion","id":"CVE-2026-2359","kev_date_added":null,"published":"2026-02-27"},{"cvss_score":8.7,"headline":"Multer vulnerable to Denial of Service via incomplete cleanup","id":"CVE-2026-3304","kev_date_added":null,"published":"2026-02-27"},{"cvss_score":7.5,"headline":"multer vulnerable to Denial of Service via crafted multipart field names","id":"CVE-2026-77078","kev_date_added":null,"published":"2026-08-28"},{"cvss_score":7.5,"headline":"multer vulnerable to Denial of Service via oversized array index in field names","id":"CVE-2026-82333","kev_date_added":null,"published":"2026-08-28"},{"cvss_score":7.5,"headline":"multer vulnerable to Denial of Service via deeply nested field names","id":"CVE-2026-5079","kev_date_added":null,"published":"2026-06-15"}],"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":"2026-08-31","vendors":["multer"]},"summary":"Remote attackers can cause denial of service by leaking file descriptors through aborted uploads in the multer Node.js library.","url":"https://insights.sbomify.com/CVE-2026-77037/"}