CVE-2026-23532

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side heap buffer overflow occurs in the FreeRDP client’s `gdi_SurfaceToSurface` path due to a mismatch between destination rectangle clamping and the actual copy size. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
freerdp	26.04 LTS resolute	Not in release
	25.10 questing	Not in release
	24.04 LTS noble	Not in release
	22.04 LTS jammy	Not in release
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
freerdp2	26.04 LTS resolute	Not in release
	25.10 questing	Not in release
	24.04 LTS noble	Fixed 2.11.5+dfsg1-1ubuntu0.1~esm3
	22.04 LTS jammy	Fixed 2.6.1+dfsg1-3ubuntu2.8
	20.04 LTS focal	Fixed 2.6.1+dfsg1-0ubuntu0.20.04.2+esm1
	18.04 LTS bionic	Fixed 2.2.0+dfsg1-0ubuntu0.18.04.4+esm3
freerdp3	26.04 LTS resolute	Not affected
	25.10 questing	Fixed 3.16.0+dfsg-2ubuntu0.3
	24.04 LTS noble	Fixed 3.5.1+dfsg1-0ubuntu1.4
	22.04 LTS jammy	Not in release

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
freerdp	Upstream: c4a7c37
freerdp2	Upstream: c4a7c37
freerdp3	Upstream: c4a7c37

Severity score breakdown

CVSS version:

Base score 7.7 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Attack requirements	None
Privileges required	None
User interaction	None
Vulnerable system - Confidentiality impact	None
Vulnerable system - Integrity impact	None
Vulnerable system - Availability impact	High
Subsequent system - Confidentiality impact	None
Subsequent system - Integrity impact	None
Subsequent system - Availability impact	None

Scores

Parameter	Value
Base score	7.7 · High
Base + Threat score	-
Base + Environmental score	-
Base + Threat + Environmental score	-

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

Base score 7.6 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality impact	Low
Integrity impact	Low
Availability impact	High

Scores

Parameter	Value
Base score	7.6 · High
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

References

Related Ubuntu Security Notices (USN)

USN-8004-1
FreeRDP vulnerabilities
3 February 2026

USN-8105-1
FreeRDP vulnerabilities
18 March 2026