Description
An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server to trigger a remote denial of service against a curl or libcurl client. Because the helper function discards zero-length UDP datagrams before counting them toward the per-call packet budget, a connected QUIC peer can continuously stream empty datagrams to indefinitely stall the client.
References
https://curl.se/docs/CVE-2026-11352.html
https://curl.se/docs/CVE-2026-11352.json
https://hackerone.com/reports/3783438
https://hackerone.com/reports/3783438
CVSS impact metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 · High
Information
Source identifier
2499f714-1537-4658-8207-48ae4bb9eae9
Vulnerability status
Modified
Published
2026-07-03T07:16:23.693Z
3 months agoLast modified
2026-09-15T07:16:25.353Z
3 weeks ago