mistral.rs: Unbounded Remote Media Fetch and Video Frame Expansion DoS

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

Unbounded Remote Media Fetch and Video Frame Expansion DoS Summary The POST /v1/chat/completions endpoint in mistral.rs fetches attacker-supplied media URLs (image, audio, video) into server memory with no byte limit, and extracts every frame of a supplied video when numframes is None. An unauthenticated remote attacker can exhaust server memory, disk space, and CPU by pointing the endpoint at an infinite-streaming HTTP server or a long high-framerate video, causing a complete denial of service. No credentials or special configuration are required; the route is open by default. Details Three independent sinks contribute to the vulnerability: 1. Unbounded image/audio fetch (mistralrs-server-core/src/util.rs:59–62) bytes().await buffers the entire HTTP response body before returning. There is no Content-Length check, no streaming limit, and no timeout specific to the media fetch. An attacker-controlled server that never closes the connection causes the server process to accumulate…

Published by the source

10 Sep 2026, 21:54 UTC

Last modified by the source

10 Sep 2026, 22:00 UTC

Source last checked

26 Oct 2026, 15:43 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-m3wp-48jr-vr4g

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-m3wp-48jr-vr4g

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# Patch Next advisory brief: GHSA-m3wp-48jr-vr4g

Advisory: mistral.rs: Unbounded Remote Media Fetch and Video Frame Expansion DoS
IDs: GHSA-m3wp-48jr-vr4g
Record: https://patchnext.com/advisories/ghsa-m3wp-48jr-vr4g (revision 2, source checked 26 Oct 2026, 15:43 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: mistralrs-server-core 0.8.18. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io mistralrs-server-core: affected <= 0.8.4; fixed in 0.8.18

## Suggested inspection (read-only)
- crates.io mistralrs-server-core: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on mistralrs-server-core.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-m3wp-48jr-vr4g (OSV record GHSA-m3wp-48jr-vr4g lists affected ranges: crates.io mistralrs-server-core >=0 <0.8.18 (fixed))
- Verified: https://github.com/advisories/GHSA-m3wp-48jr-vr4g (GitHub-reviewed advisory GHSA-m3wp-48jr-vr4g lists affected ranges: crates.io mistralrs-server-core >=0 <=0.8.4)

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