# CVE-2025-8849: Denial of Service in danny-avila/librechat

> Attackers can cause a denial of service in LibreChat by submitting excessively large parameters to the memories endpoint, crashing the backend service.

- **Severity:** Medium 5.4 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Oct 2025
- **Updated:** 31 Oct 2025
- **Also known as:** GHSA-2q3x-64cr-5mp5

## What is CVE-2025-8849?

CVE-2025-8849 is a medium-severity denial of service vulnerability in Librechat Librechat, published on 30 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

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.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2025-8849?

It affects 1 product.


Products: Librechat Librechat.

## How do I fix CVE-2025-8849?

No fix has been published for CVE-2025-8849 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-8849 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-8849 exists.

## Other vulnerabilities in Librechat Librechat

- [CVE-2026-32625](https://insights.sbomify.com/CVE-2026-32625/): LibreChat Exfiltrates Server Secrets via MCP Server URL Injection (critical 9.6)
- [CVE-2024-11167](https://insights.sbomify.com/CVE-2024-11167/): Improper Access Control in danny-avila/librechat (critical 9.4)
- [CVE-2026-22252](https://insights.sbomify.com/CVE-2026-22252/): LibreChat MCP Stdio Remote Command Execution (critical 9.1)
- [CVE-2025-69222](https://insights.sbomify.com/CVE-2025-69222/): LibreChat is vulnerable to Server-Side Request Forgery due to missing restrictions (critical 9.1)
- [CVE-2024-41704](https://insights.sbomify.com/CVE-2024-41704/): Path traversal in n/a (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-8849 and fix it if it is affected.

What it is: CVE-2025-8849 is a medium-severity denial of service vulnerability in Librechat Librechat, published on 30 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-8849 exists.

Affected product: Librechat Librechat. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-8849/ (Markdown: https://insights.sbomify.com/CVE-2025-8849/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-8849
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-8849
- OSV: https://osv.dev/vulnerability/CVE-2025-8849

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-8849/
Summaries are generated and may contain mistakes; the official description above is the record.