CVE-2026-85090

FreeRDP before 3.31.0 Heap Out-of-Bounds Read via AVC444

MEDIUM
5.4
CVSS Score
Published: September 3, 2026 at 01:04 AM UTC
Updated: September 9, 2026 at 07:37 PM UTC
1 product affected across 1 vendorFreeRDP

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.3%
SSVC
PoC

Description

FreeRDP before 3.31.0 contains a heap out-of-bounds read vulnerability in the general_ChromaV1ToYUV444 function during AVC444 chroma plane reconstruction. A malicious RDP server can craft a RFX_AVC444_BITMAP_STREAM with specific frame geometry to trigger an out-of-bounds memory read past the allocated luma plane.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 3.31.03.0.0 ≤ v < 3.31.03.0.0
Vendor states this is fixed in 3.31.0 (unaffected)

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUMVulnCheck
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusANALYZED
CWE
CWE-125

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