{"id":"CVE-2026-8159","aliases":["CLSA-2026-1784682964","CLSA-2026-1785291243","DEBIAN-CVE-2026-8159","EUVD-2026-29439","GHSA-65x3-rw7q-gx94","ROOT-APP-NPM-CVE-2026-8159","UBUNTU-CVE-2026-8159"],"status":"published","title":"multiparty vulnerable to ReDoS via filename parsing","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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00335,"percentile":0.27016,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1333"],"published":"2026-05-12T08:35:39Z","modified":"2026-10-28T02:31:06Z","fixes":[{"ecosystem":"npm","package":"multiparty","fixed_in":["4.3.0"],"sources":["ghsa","osv"]},{"ecosystem":"TuxCare:npm","package":"multiparty","fixed_in":["2.2.0-tuxcare.1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"node-multiparty","fixed_in":["4.3.0-1"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"@rootio/multiparty","fixed_in":["3.3.2-root.io.1"],"sources":["osv"]},{"ecosystem":"Root:npm","package":"multiparty","fixed_in":["3.3.2-aikido.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"4.2.3"},{"fixed":"4.3.0"}]}]},{"source":"osv","ecosystem":"TuxCare:npm","package":"multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.3.2-tuxcare.0"},{"fixed":"3.3.2-tuxcare.1"}]}],"versions":["3.3.2"],"bundled":3},{"source":"osv","ecosystem":"TuxCare:npm","package":"multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.2.0-tuxcare.0"},{"fixed":"2.2.0-tuxcare.1"}]}],"versions":["2.2.0"]},{"source":"osv","ecosystem":"Debian:12","package":"node-multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.3-2","4.2.3-3","4.2.3-4","4.2.3-5","4.3.0+~4.2.1-1","4.3.0-1","4.3.1+~4.2.1-1"]},{"source":"osv","ecosystem":"Debian:13","package":"node-multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.3-3","4.2.3-4","4.2.3-5","4.3.0+~4.2.1-1","4.3.0-1","4.3.1+~4.2.1-1"]},{"source":"osv","ecosystem":"Debian:14","package":"node-multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.3.0-1"}]}],"versions":["4.2.3-3","4.2.3-4","4.2.3-5"]},{"source":"osv","ecosystem":"npm","package":"multiparty","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.3.0"}]}]},{"source":"osv","ecosystem":"Root:npm","package":"@rootio/multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.2-root.io.1"}]}]},{"source":"osv","ecosystem":"Root:npm","package":"multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3.2-aikido.1"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"node-multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.0-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"node-multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.0-1","4.0.0-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"node-multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.1-1","4.2.1-2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"node-multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.2-2","4.2.2-3"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"node-multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.3-2"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"node-multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.3-2","4.2.3-3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"node-multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.3-5","4.3.0+~4.2.1-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"node-multiparty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.3-3","4.2.3-4build1","4.2.3-5"]}],"products":[{"vendor":"multiparty","product":"multiparty"},{"vendor":"pillarjs","product":"multiparty"}],"references":[{"url":"https://github.com/pillarjs/multiparty/security/advisories/GHSA-65x3-rw7q-gx94","tags":["Mitigation","Vendor Advisory","advisory","web","report"]},{"url":"https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS","tags":["Not Applicable","web"]},{"url":"https://cna.openjsf.org/security-advisories.html","tags":["Third Party Advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8159","tags":["advisory"]},{"url":"https://github.com/pillarjs/multiparty/releases/tag/v4.3.0","tags":["web"]},{"url":"https://github.com/advisories/GHSA-65x3-rw7q-gx94"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8159.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-8159","tags":["advisory"]},{"url":"https://github.com/pillarjs/multiparty","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-8159","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-8159","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-8159","title":"multiparty vulnerable to ReDoS via filename parsing","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.","status":"published","published":"2026-05-12T08:35:39.564Z","modified":"2026-05-12T12:33:59.418Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T13:48:02.226896Z"}],"euvd":[{"id":"EUVD-2026-29439","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.","status":"published","published":"2026-05-12T08:35:39Z","modified":"2026-05-12T12:33:59Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T19:04:37.66514Z"}],"ghsa":[{"id":"GHSA-65x3-rw7q-gx94","title":"multiparty vulnerable to ReDoS via filename parsing","description":"### Impact\n\nmultiparty@4.2.3 and lower versions are vulnerable to denial of service via regular expression backtracking in the `Content-Disposition` filename parameter parser. A multipart upload with a long header value containing `!filename=\"1` repeated can cause regex matching to take seconds, blocking the event loop. Any service accepting multipart uploads via multiparty is affected.\n\n### Patches\n\nUsers should upgrade to multiparty@4.3.0 or higher.\n\n### Workarounds\n\nNone. Limiting upload sizes at the proxy/gateway layer reduces but does not eliminate the attack surface, since a small ~8 KB header is sufficient to trigger the vulnerable backtracking.\n\n### Resources\n\n- [OWASP: Regular expression Denial of Service (ReDoS)](https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS)","status":"published","published":"2026-05-18T17:40:10Z","modified":"2026-05-18T17:40:10Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:40:11.298154Z"}],"nvd":[{"id":"CVE-2026-8159","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.","status":"published","published":"2026-05-12T10:16:48.857Z","modified":"2026-06-17T11:03:34.277Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:12:18.613259Z"}],"osv":[{"id":"CVE-2026-8159","title":"multiparty vulnerable to ReDoS via filename parsing","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.","status":"published","published":"2026-05-12T08:35:39.564Z","modified":"2026-10-28T02:31:06.216155323Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T15:45:18.131258Z"},{"id":"DEBIAN-CVE-2026-8159","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.","status":"published","published":"2026-05-12T10:16:48.857Z","modified":"2026-10-01T03:03:51.541865743Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:46:04.577397Z"},{"id":"GHSA-65x3-rw7q-gx94","title":"multiparty vulnerable to ReDoS via filename parsing","description":"### Impact\n\nmultiparty@4.2.3 and lower versions are vulnerable to denial of service via regular expression backtracking in the `Content-Disposition` filename parameter parser. A multipart upload with a long header value containing `!filename=\"1` repeated can cause regex matching to take seconds, blocking the event loop. Any service accepting multipart uploads via multiparty is affected.\n\n### Patches\n\nUsers should upgrade to multiparty@4.3.0 or higher.\n\n### Workarounds\n\nNone. Limiting upload sizes at the proxy/gateway layer reduces but does not eliminate the attack surface, since a small ~8 KB header is sufficient to trigger the vulnerable backtracking.\n\n### Resources\n\n- [OWASP: Regular expression Denial of Service (ReDoS)](https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS)","status":"published","published":"2026-05-18T17:40:10Z","modified":"2026-05-18T17:56:25.576353Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T15:46:39.266402Z"},{"id":"UBUNTU-CVE-2026-8159","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.","status":"published","published":"2026-05-12T10:16:00Z","modified":"2026-10-17T13:01:10.640321509Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:57:22.213888Z"},{"id":"CLSA-2026-1784682964","title":"TuxCare security update for multiparty (3 CVEs)","description":"TuxCare rebuilt multiparty to address 3 CVEs. Fixed in 3.3.2-tuxcare.1.","status":"published","published":"2026-08-04T14:52:46Z","modified":"2026-10-15T09:47:54.13807981Z","updated_at":"2026-11-02T15:43:46.482572Z"},{"id":"CLSA-2026-1785291243","title":"TuxCare security update for multiparty (1 CVE)","description":"TuxCare rebuilt multiparty to address 1 CVE. Fixed in 2.2.0-tuxcare.1.","status":"published","published":"2026-08-04T14:52:50Z","modified":"2026-10-15T09:48:03.783693699Z","updated_at":"2026-11-02T15:43:46.482572Z"},{"id":"ROOT-APP-NPM-CVE-2026-8159","title":"CVE-2026-8159 in @rootio/multiparty - Patched by Root","description":"Root has patched CVE-2026-8159 in the @rootio/multiparty package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-07-14T13:51:17Z","modified":"2026-07-14T19:22:03.03547405Z","updated_at":"2026-11-02T15:53:27.649662Z"}]}}