Input validation error in LibreChat - CVE-2026-31949
Published: April 27, 2026
Vulnerability identifier: #VU128104
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31949
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: LibreChat
Affected software:
LibreChat
LibreChat
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper input validation in the DELETE /api/convos endpoint when handling malformed requests with a missing or null req.body.arg value. A remote user can send a specially crafted request to cause a denial of service.
The issue triggers an unhandled TypeError that bypasses Express error handling and causes the Node.js process to exit.
How to mitigate CVE-2026-31949
Install security update from vendor's website.