CVE-2026-11352 — QUIC zero-length UDP datagrams busy-loop
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…
Published: 2026-07-03 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7