CVE-2026-11352

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.

Affected products

Linuxmint, Curl, Libcurl

Haxx Curl

< 8.21.0

CVSS 3.1

7.5 HIGH

EPSS

0.6% (44th percentile)

Weakness

CWE-835

NVD status

Analyzed

Published

2026-07-03

No exploit for CVE-2026-11352 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.