CVE-2026-54024 LibreChat: Incomplete Fix for CVE-2024-11171 — Conversation Import Multer Instance Missing File Size Limits

Medium 6.5 Published 25 Jun 2026 Updated 25 Jun 2026

Authenticated users can upload arbitrarily large files via the conversation import endpoint to exhaust server resources, 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-2026-54024?

CVE-2026-54024 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-2024-11171 (commit bb58a2d0) added limits: { fileSize } to createMulterInstance() in the file upload routes. However, the POST /api/convos/import endpoint uses a separate multer instance that was never updated with the same limits configuration. Combined with the application-level size check being disabled by default (the CONVERSATION_IMPORT_MAX_FILE_SIZE_BYTES env var is commented out in .env.example), an authenticated user can upload arbitrarily large files to exhaust server disk space and memory. This vulnerability is fixed in 0.8.4-rc1.

Weakness: CWE-770

Which versions are affected by CVE-2026-54024?

It affects 1 product.

Products include Librechat Librechat.

How do I fix CVE-2026-54024?

No fix has been published for CVE-2026-54024 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-2026-54024 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54024 exists.

All Librechat Librechat vulnerabilities

Sources

Also known as GHSA-52f6-fqwv-jccf.