Infinite loop in cURL - CVE-2026-11352
Published: June 24, 2026
Vulnerability identifier: #VU135072
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-11352
CWE-ID: CWE-835
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: curl.haxx.se
Affected software:
cURL
cURL
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a loop with an unreachable exit condition in the QUIC UDP receive function when processing zero-length UDP datagrams from a connected HTTP/3 server. A remote attacker can continuously stream empty datagrams to cause a denial of service.
This issue only triggers on platforms featuring the recvmmsg() function call.
How to mitigate CVE-2026-11352
Install security update from vendor's website.