{"id":"CVE-2026-11352","title":"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 tow…","summary":"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 tow…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-835"],"vendor":"haxx","product":"curl","affected":["curl >= 8.18.0, < 8.21.0"],"patched":["curl 8.21.0"],"published":"2026-07-03","updated":"2026-09-15","sourceUpdated":"2026-09-15T07:16:25.353","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-11352","references":[{"url":"https://curl.se/docs/CVE-2026-11352.html","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"https://curl.se/docs/CVE-2026-11352.json","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"https://hackerone.com/reports/3783438","label":"2499f714-1537-4658-8207-48ae4bb9eae9"},{"url":"https://hackerone.com/reports/3783438","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-07-06T18:26:03.249042Z"},"epss":0.00715,"epssPercentile":0.5187,"ingestedAt":"2026-07-04T04:55:39.411Z","slug":"CVE-2026-11352","body":"## Overview\n\nAn 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.\n\n## Affected\n\n- `curl >= 8.18.0, < 8.21.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `curl 8.21.0`","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":203476,"id":"CVE-2026-11352","ts":1789457645637,"field":"exploit_available","old":"false","new":"true"},{"seq":203475,"id":"CVE-2026-11352","ts":1789457645637,"field":"cvss","old":null,"new":"7.5"},{"seq":203474,"id":"CVE-2026-11352","ts":1789457645637,"field":"severity","old":"none","new":"high"}]}