Memory leak in WeeChat - #VU147385
Published: September 8, 2026
Vulnerability identifier: #VU147385
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-401
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 missing release of memory after effective lifetime in the relay api handshake handler when processing valid JSON request bodies that are not objects. A remote attacker can repeatedly send crafted POST requests to /api/handshake to cause a denial of service.
Affected software
WeeChat
Remediation
Install security update from vendor's website.
WeeChat - update to 4.9.3