Double free in WeeChat - #VU139867
Published: July 28, 2026
Vulnerability identifier: #VU139867
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-415
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to a boundary error in the relay_remote_event_recv() function. A remote attacker can pass specially crafted data to the application, trigger double free error and perform a denial of service (DoS) attack on the system.
Affected software
WeeChat
Remediation
Install updates from vendor's website.
WeeChat - update to 4.9.5