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5.4
CVE-2025-8849: LibreChat 0.7.9 can be crashed by large data inputs
CVE-2025-8849 · published 1 year ago
Summary
The LibreChat service may become unstable and stop working properly if it receives very large amounts of data. This could happen when users or attackers send unusually big data to the service's memories endpoint. To stay safe, update to a newer version of LibreChat.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| librechat | librechat |
0.7.9 cpe:2.3:a:librechat:librechat:0.7.9:-:*:*:*:*:*:* |
Original advisory text
Denial of Service in danny-avila/librechat
LibreChat version 0.7.9 is vulnerable to a Denial of Service (DoS) attack due to unbounded parameter values in the `/api/memories` endpoint. The `key` and `value` parameters accept arbitrarily large inputs without proper validation, leading to a null pointer error in the Rust-based backend when excessively large values are submitted. This results in the inability to create new memories, impacting the stability of the service.
References
- https://github.com/danny-avila/librechat/commit/edf33bedcbb08c33e59df76f06454ed7... Patch
- https://huntr.com/bounties/e9d9404c-cd19-4226-a580-9cba14b7d7d6 URL
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/8xxx/CVE-2025-8849.j... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2025-8849 Vendor Advisory
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker partial control
Severity
5.4
Medium
Type
CWE-400Uncontrolled Resource Consumption
Timeline
Published30 Oct 2025
Updated4 Nov 2026
First seen7 Mar 2026
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