CVE-2026-125394 json
FreeRDP before 3.33.0 Use-After-Free via Stale Brush Cache Pointer
published 2d ago modified 2d ago also EUVD-2026-120557 , GHSA-fw6x-h8gw-778w
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository FreeRDP/FreeRDP. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 11%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- FreeRDP FreeRDP 3.33.0
Is CVE-2026-125394 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.3 | 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 |
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L |
| CNA | 4.0 | 5.3 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L |
Affected products
- FreeRDP FreeRDP
Classification
- Weakness
-
- CWE-416 Use After Free
References
-
github.com
/FreeRDP/FreeRDP/commit/ffc6b976e3589b768e8e279bc61dfb7b5896e832
patch
-
github.com
/FreeRDP/FreeRDP/security/advisories/GHSA-fw6x-h8gw-778w
vendor-advisory, advisory
-
github.com
/FreeRDP/FreeRDP/releases/tag/3.33.0
release-notes
-
github.com
/FreeRDP/FreeRDP/blob/3.32.2/libfreerdp/cache/brush.c#L80
technical-description
-
vulncheck.com
/advisories/freerdp-before-3.33.0-use-after-free-via-stale-brush-cache-pointer
third-party-advisory
Sources
- CVE List CVE-2026-125394
- NVD CVE-2026-125394
- Maintainer advisory GHSA-fw6x-h8gw-778w
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of FreeRDP/FreeRDP published their own advisory on GitHub. Reviewed sources take precedence over it.