{"id":"CVE-2026-11352","state":"PUBLISHED","title":"QUIC zero-length UDP datagrams busy-loop","description":"An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server\nto trigger a remote denial of service against a curl or libcurl client.\nBecause the helper function discards zero-length UDP datagrams before counting\nthem toward the per-call packet budget, a connected QUIC peer can continuously\nstream empty datagrams to indefinitely stall the client.","publishedAt":"2026-07-03T06:12:10.777Z","updatedAt":"2026-09-15T06:02:38.244Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"curl","products":["curl curl"],"affected":[{"vendor":"curl","product":"curl","defaultStatus":"unaffected","versions":[{"version":"8.18.0","status":"affected","lessThan":"8.20.1","versionType":"semver"}]},{"vendor":"curl","product":"curl","defaultStatus":"unaffected","versions":[{"version":"6a3d0b6d631d5e9bec797306b5b41a9f440a088d","status":"affected","lessThan":"56eca2afb4806f1032872fa97d1834b3c1385276","versionType":"git"}],"repo":"https://github.com/curl/curl.git"},{"vendor":"curl","product":"curl","defaultStatus":"unaffected","versions":[{"version":"8.20.0","status":"affected"},{"version":"8.19.0","status":"affected"},{"version":"8.18.0","status":"affected"}]}],"references":["https://curl.se/docs/CVE-2026-11352.json","https://curl.se/docs/CVE-2026-11352.html","https://hackerone.com/reports/3783438"],"weaknesses":["CWE-835"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/11xxx/CVE-2026-11352.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-11352","state":"PUBLISHED","datePublished":"2026-07-03T06:12:10.777Z","dateUpdated":"2026-09-15T06:02:38.244Z","assignerShortName":"curl","assignerOrgId":"2499f714-1537-4658-8207-48ae4bb9eae9","dateReserved":"2026-06-05T11:23:43.389Z"},"containers":{"cna":{"title":"QUIC zero-length UDP datagrams busy-loop","descriptions":[{"lang":"en","value":"An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server\nto trigger a remote denial of service against a curl or libcurl client.\nBecause the helper function discards zero-length UDP datagrams before counting\nthem toward the per-call packet budget, a connected QUIC peer can continuously\nstream empty datagrams to indefinitely stall the client."}],"affected":[{"vendor":"curl","product":"curl","defaultStatus":"unaffected","versions":[{"version":"8.18.0","status":"affected","lessThan":"8.20.1","versionType":"semver"}]},{"vendor":"curl","product":"curl","defaultStatus":"unaffected","versions":[{"version":"6a3d0b6d631d5e9bec797306b5b41a9f440a088d","status":"affected","lessThan":"56eca2afb4806f1032872fa97d1834b3c1385276","versionType":"git"}],"repo":"https://github.com/curl/curl.git"},{"vendor":"curl","product":"curl","defaultStatus":"unaffected","versions":[{"version":"8.20.0","status":"affected"},{"version":"8.19.0","status":"affected"},{"version":"8.18.0","status":"affected"}]}],"references":[{"url":"https://curl.se/docs/CVE-2026-11352.json"},{"url":"https://curl.se/docs/CVE-2026-11352.html"},{"url":"https://hackerone.com/reports/3783438"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-835","lang":"en","description":"Loop with Unreachable Exit Condition ('Infinite Loop')","type":"CWE"}]}],"providerMetadata":{"shortName":"curl","orgId":"2499f714-1537-4658-8207-48ae4bb9eae9","dateUpdated":"2026-09-15T06:02:38.244Z"},"x_osv":{"schema_version":"1.5.0","id":"CURL-CVE-2026-11352","aliases":["CVE-2026-11352"],"summary":"QUIC zero-length UDP datagrams busy-loop","modified":"2026-09-07T10:34:51.00Z","database_specific":{"package":"curl","affects":"both","URL":"https://curl.se/docs/CVE-2026-11352.json","www":"https://curl.se/docs/CVE-2026-11352.html","issue":"https://hackerone.com/reports/3783438","CWE":{"id":"CWE-835","desc":"Loop with Unreachable Exit Condition ('Infinite Loop')"},"last_affected":"8.20.0","severity":"Low"},"published":"2026-06-24T08:00:00.00Z","affected":[{"ranges":[{"type":"SEMVER","events":[{"introduced":"8.18.0"},{"fixed":"8.20.1"}]},{"type":"GIT","repo":"https://github.com/curl/curl.git","events":[{"introduced":"6a3d0b6d631d5e9bec797306b5b41a9f440a088d"},{"fixed":"56eca2afb4806f1032872fa97d1834b3c1385276"}]}],"versions":["8.20.0","8.19.0","8.18.0"]}],"credits":[{"name":"vectorqueue on hackerone (AntAISecurityLab)","type":"finder"},{"name":"Stefan Eissing","type":"remediation developer"}],"details":"An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server\nto trigger a remote denial of service against a curl or libcurl client.\nBecause the helper function discards zero-length UDP datagrams before counting\nthem toward the per-call packet budget, a connected QUIC peer can continuously\nstream empty datagrams to indefinitely stall the client."},"credits":[{"lang":"en","value":"vectorqueue on hackerone 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