CVE-2026-54037 LibreChat: Incomplete Fix for CVE-2025-7105 — /api/convos/duplicate Lacks Rate Limiting Applied to /api/convos/fork

Medium 6.5 Published 25 Jun 2026 Updated 25 Jun 2026

Authenticated users can exhaust server resources by bypassing rate limits on the conversation duplication endpoint, causing denial of service.

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-2026-54037?

CVE-2026-54037 is a medium-severity denial of service vulnerability in Librechat Librechat, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

LibreChat is an enhanced ChatGPT clone that supports multiple AI providers. Prior to 0.8.4-rc1, the fix for CVE-2025-7105 added forkIpLimiter and forkUserLimiter rate limiters to POST /api/convos/fork to prevent rapid-fire conversation duplication. However, the POST /api/convos/duplicate endpoint — which is in the same file and performs the exact same expensive database operations — was not given any rate limiter. An authenticated user can bypass the CVE-2025-7105 fix by using /duplicate instead of /fork to exhaust server resources. This vulnerability is fixed in 0.8.4-rc1.

Weakness: CWE-770

Which versions are affected by CVE-2026-54037?

It affects 1 product.

Products include Librechat Librechat.

How do I fix CVE-2026-54037?

No fix has been published for CVE-2026-54037 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-2026-54037 being exploited?

There is no known exploitation of CVE-2026-54037 in the wild and no public exploit code.

All Librechat Librechat vulnerabilities

Sources

Also known as GHSA-g445-9wq6-jf3v.