CVE-2026-31949 LibreChat Denial of Service (DoS) via Unhandled Exception in DELETE /api/convos

Medium 6.5 Published 13 Mar 2026 Updated 16 Mar 2026

An authenticated attacker can crash the LibreChat server by sending malformed requests to the conversation deletion endpoint.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-31949?

CVE-2026-31949 is a medium-severity denial of service vulnerability in Librechat Librechat, published on 13 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

LibreChat is a ChatGPT clone with additional features. Prior to 0.8.3-rc1, a Denial of Service (DoS) vulnerability exists in the DELETE /api/convos endpoint that allows an authenticated attacker to crash the Node.js server process by sending malformed requests. The DELETE /api/convos route handler attempts to destructure req.body.arg without validating that it exists. The server crashes due to an unhandled TypeError that bypasses Express error handling middleware and triggers process.exit(1). This vulnerability is fixed in 0.8.3-rc1.

Weakness: CWE-248

Which versions are affected by CVE-2026-31949?

It affects 1 product.

Products include Librechat Librechat.

How do I fix CVE-2026-31949?

No fix has been published for CVE-2026-31949 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-31949 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-31949 exists.

All Librechat Librechat vulnerabilities

Sources

Also known as GHSA-5m32-chq6-232p.