{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-11352","assignerOrgId":"2499f714-1537-4658-8207-48ae4bb9eae9","state":"PUBLISHED","assignerShortName":"curl","dateReserved":"2026-06-05T11:23:43.389Z","datePublished":"2026-07-03T06:12:10.777Z","dateUpdated":"2026-09-15T06:02:38.244Z"},"containers":{"cna":{"providerMetadata":{"orgId":"2499f714-1537-4658-8207-48ae4bb9eae9","shortName":"curl","dateUpdated":"2026-09-15T06:02:38.244Z"},"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","versions":[{"version":"8.18.0","status":"affected","versionType":"semver","lessThan":"8.20.1"}],"defaultStatus":"unaffected"},{"vendor":"curl","product":"curl","versions":[{"version":"6a3d0b6d631d5e9bec797306b5b41a9f440a088d","status":"affected","versionType":"git","lessThan":"56eca2afb4806f1032872fa97d1834b3c1385276"}],"defaultStatus":"unaffected","repo":"https://github.com/curl/curl.git"},{"vendor":"curl","product":"curl","versions":[{"version":"8.20.0","status":"affected"},{"version":"8.19.0","status":"affected"},{"version":"8.18.0","status":"affected"}],"defaultStatus":"unaffected"}],"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"}],"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."},"problemTypes":[{"descriptions":[{"lang":"en","description":"Loop with Unreachable Exit Condition ('Infinite Loop')","cweId":"CWE-835","type":"CWE"}]}],"credits":[{"lang":"en","value":"vectorqueue on hackerone (AntAISecurityLab)","type":"finder"},{"lang":"en","value":"Stefan Eissing","type":"remediation developer"}],"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"references":[{"url":"https://hackerone.com/reports/3783438","tags":["exploit"]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-07-06T18:26:03.249042Z","id":"CVE-2026-11352","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-06T18:27:49.432Z"}}]}}