VDB-341800 · CVE-2026-23732 · EUVD-2026-3313

FreeRDP up to 3.20.x FastGlyph Parser heap-based overflow

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7.2	$0-$5k	0.00

Summaryinfo

A vulnerability was found in FreeRDP up to 3.20.x and classified as critical. This affects an unknown function of the component FastGlyph Parser. Executing a manipulation can lead to heap-based overflow. This vulnerability is registered as CVE-2026-23732. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in FreeRDP up to 3.20.x. It has been declared as critical. This vulnerability affects an unknown code of the component FastGlyph Parser. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, FastGlyph parsing trusts `cbData`/remaining length and never validates against the minimum size implied by `cx/cy`. A malicious server can trigger a client‑side global buffer overflow, causing a crash (DoS). Version 3.21.0 contains a patch for the issue.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-23732 since 01/15/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 297418 (SUSE SLED15 / SLES15 Security Update : freerdp (SUSE-SU-2026:0345-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.21.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (297418), EUVD (EUVD-2026-3313) and CERT Bund (WID-SEC-2026-0145). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

Open Source FreeRDP

Productinfo

Type

Remote Access Software

Name

FreeRDP

Version

License

open-source

Website

Product: https://github.com/FreeRDP/FreeRDP/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Proof-of-Concept

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 297418
Nessus Name: SUSE SLED15 / SLES15 Security Update : freerdp (SUSE-SU-2026:0345-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: FreeRDP 3.21.0

Timelineinfo

01/15/2026 CVE reserved
01/19/2026 +4 days Advisory disclosed
01/19/2026 +0 days VulDB entry created
01/31/2026 +12 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-23732 (🔒)
GCVE (CVE): GCVE-0-2026-23732
GCVE (VulDB): GCVE-100-341800
EUVD: 🔒
CERT Bund: WID-SEC-2026-0145 - FreeRDP: Mehrere Schwachstellen ermöglichen DoS und Codeausführung

Entryinfo

Created: 01/19/2026 19:06
Updated: 01/31/2026 18:33
Changes: 01/19/2026 19:06 (68), 01/19/2026 21:51 (2), 01/20/2026 07:28 (1), 01/20/2026 18:14 (7), 01/29/2026 02:01 (11), 01/31/2026 18:33 (2)
Complete: 🔍
Cache ID: 216::103

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