CVE-2026-91948

High

Description

FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in server-side static virtual channel handling when CHANNEL_OPTION_SHOW_PROTOCOL is enabled. Authenticated clients can queue oversized channel messages that cause buffer underflow and corrupt heap memory including live pointers, potentially enabling code execution.

SeverityHigh

CVSS7.5

Exploit probability—

ProductFreeRDP

PublishedSep 15, 2026

First seenSep 15, 2026

Weakness typeCWE-191CWE-191

How to fix

Update

FreeRDP FreeRDP3.31.0 or later

Patches

github.com/FreeRDP/FreeRDP/commit/40d9202cd95551600c07437ce6bd5ecd7d31e57b

Vendor advisories

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9jcm-x588-gh26

Affected products

Product	Affected versions	Fixed in
FreeRDP FreeRDP	3.28.0 ≤ v < 3.31.0	3.31.0

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.