November 14, 2026

CVE Watchtower

CVE-2026-125394FreeRDP FreeRDP Use After Free

NVD

Vulnerability 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.
Severity Level
MEDIUM(5.3)
Published Date
Nov 9, 2026
Last Modified
Nov 13, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.21%Probability
Root Weakness (CWE)
CWE-416: Use After Free ↗
The product reuses or references memory after it has been freed, which can cause a crash or execution of arbitrary code.
CVSS v4.0 Base Metrics — Score 5.3 (MEDIUM)
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
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredNone
User InteractionPassive
Confidentiality (Vulnerable System)Low
Integrity (Vulnerable System)None
Availability (Vulnerable System)Low
Confidentiality (Subsequent System)None
Integrity (Subsequent System)None
Availability (Subsequent System)None
Show CVSS v3.x metrics (score 5.4)
CVSS v3.1 Base Metrics — Score 5.4 (MEDIUM)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityLow
IntegrityNone
AvailabilityLow

Affected & Patched Versions

Affected Versions
  • FreeRDP FreeRDP < 3.33.0
Patched Versions
  • FreeRDP FreeRDP 3.33.0

What to do

Fix it during your normal patch cycle. No exploitation is confirmed yet.

  1. Check whether you run FreeRDP FreeRDP and which version.
  2. Update to a patched version listed above, then confirm the new version.

Timeline

  • Nov 9, 2026Published
  • Nov 13, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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External References

Data last checked: Nov 14, 2026 00:39 UTC