Infinite loop in cURL - CVE-2026-11352
Published: June 24, 2026
Vulnerability identifier: #VU135072
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2026-11352
CWE-ID: CWE-835
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
cURL
LANTIME Operating System Firmware (LTOS)
Ubuntu
curl (Ubuntu package)
LANTIME Operating System Firmware (LTOS)
Ubuntu
curl (Ubuntu package)
How to mitigate CVE-2026-11352
Install security update from vendor's website.
cURL - update to 8.21.0
LANTIME Operating System Firmware (LTOS) - update to 7.10.013
curl (Ubuntu package) - addressed in versions 7.35.0-1ubuntu2.20+esm21, 7.47.0-1ubuntu2.19+esm17, 7.58.0-2ubuntu3.24+esm10, 7.68.0-1ubuntu2.25+esm5, 8.5.0-2ubuntu10.11, 8.14.1-2ubuntu1.5, 8.18.0-1ubuntu2.3
LANTIME Operating System Firmware (LTOS) - update to 7.10.013
curl (Ubuntu package) - addressed in versions 7.35.0-1ubuntu2.20+esm21, 7.47.0-1ubuntu2.19+esm17, 7.58.0-2ubuntu3.24+esm10, 7.68.0-1ubuntu2.25+esm5, 8.5.0-2ubuntu10.11, 8.14.1-2ubuntu1.5, 8.18.0-1ubuntu2.3