CVE-2026-121952

Critical

Description

FreeRDP before 3.32.2 has an out-of-bounds write in the proxy because rdp_read_bitmap_cache_v2_capability_set rejects only numCellCaches values above 5, yet the bitmap cache v2 cell array is later accessed at fixed indices 0 through 4. A client connecting to the proxy can declare fewer than five cell caches in its Confirm Active, causing heap corruption, heap data leakage to the backend, or a crash.

SeverityCritical

CVSS9.8

Exploit probability—

ProductFreeRDP

PublishedNov 4, 2026

First seenNov 4, 2026

Weakness typeCWE-787Out-of-bounds write

How to fix

Update

FreeRDP3.32.2 or later
freerdp freerdp3.32.2 or later

Vendor advisories

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-xc85-4mqc-xgcx

Affected products

Product	Affected versions	Fixed in
FreeRDP	No range specified	3.32.2
freerdp freerdp	v < 3.32.2	3.32.2

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