CVE-2026-23732
published 2026-01-19CVE-2026-23732: FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, FastGlyph parsing trusts `cbData`/remaining length and never…
PriorityP345high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.48%
38.4th percentile
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.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | freerdp2 | < freerdp3 3.21.0+dfsg-1 (forky) | freerdp3 3.21.0+dfsg-1 (forky) |
| debian | freerdp3 | < freerdp3 3.21.0+dfsg-1 (forky) | freerdp3 3.21.0+dfsg-1 (forky) |
| freerdp | freerdp | < 3.21.0 | 3.21.0 |
| ubuntu | freerdp2 | — | — |
| ubuntu | freerdp3 | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.05.5MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
osv5.5MEDIUM
vendor_ubuntu9.1CRITICAL
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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VulDB
FreeRDP up to 3.20.x FastGlyph Parser heap-based overflow (EUVD-2026-3313 / Nessus ID 297418)
vuldb·2026-06-11·CVSS 7.5
CVE-2026-23732 [HIGH] FreeRDP up to 3.20.x FastGlyph Parser heap-based overflow (EUVD-2026-3313 / Nessus ID 297418)
A vulnerability has been found in FreeRDP up to 3.20.x and classified as critical. The impacted element is an unknown function of the component FastGlyph Parser. Performing a manipulation results in heap-based buffer overflow.
This vulnerability is cataloged as CVE-2026-23732. It is possible to initiate the attack remotely. There is no exploit available.
The affected component should be upgraded.
OSV
CVE-2026-23732: FreeRDP is a free implementation of the Remote Desktop Protocol
osv·2026-01-19·CVSS 5.5
CVE-2026-23732 [MEDIUM] CVE-2026-23732: FreeRDP is a free implementation of the Remote Desktop Protocol
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.
Ubuntu
FreeRDP vulnerabilities
vendor_ubuntu·2026-06-16·CVSS 9.1
CVE-2026-45700 [CRITICAL] FreeRDP vulnerabilities
Title: FreeRDP vulnerabilities
Summary: Several security issues were fixed in FreeRDP.
It was discovered that FreeRDP incorrectly handled memory under certain
circumstances, which could lead to an out-of-bounds heap write. An
attacker could possibly use this issue to cause a denial of service or
execute arbitrary code. (CVE-2026-45700)
In addition, this update fixes a regression introduced in USN-8105-1.
The update introduces a complete fix for CVE-2026-22858, CVE-2026-23732
and CVE-2026-25952 in Ubuntu 24.04 LTS and Ubuntu 25.10.
Instructions: In general, a standard system update will make all the necessary changes.
Ubuntu
FreeRDP vulnerabilities
vendor_ubuntu·2026-03-18
CVE-2026-25954 FreeRDP vulnerabilities
Title: FreeRDP vulnerabilities
Summary: Several security issues were fixed in FreeRDP.
It was discovered that FreeRDP incorrectly handled certain RDP packets. A
remote attacker could use this issue to cause FreeRDP to crash, resulting
in a denial of service, or possibly execute arbitrary code.
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow
vendor_redhat·2026-01-19·CVSS 5.5
CVE-2026-23732 [MEDIUM] CWE-122 freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow
freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow
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.
A flaw was found in FreeRDP. A malicious server can exploit a vulnerability in FastGlyph parsing, which improperly trusts data length without sufficient validation. This can lead to a client-side global buffer overflow, resulting in a denial of service (DoS) due to a crash. For this vulnerability to be exploited, a client must connect to a maliciously-configured server.
State
Debian
CVE-2026-23732: freerdp2 - FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to versio...
vendor_debian·2026·CVSS 5.5
CVE-2026-23732 [MEDIUM] CVE-2026-23732: freerdp2 - FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to versio...
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.
Scope: local
bookworm: open
bullseye: open
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-23732 freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow
bugzilla·2026-01-19·CVSS 5.5
CVE-2026-23732 [MEDIUM] CVE-2026-23732 freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow
CVE-2026-23732 freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow
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.
Discussion:
This issue has been addressed in the following products:
Red Hat Enterprise Linux 9
Via RHSA-2026:6340 https://access.redhat.com/errata/RHSA-2026:6340
---
This issue has been addressed in the following products:
Red Hat Enterprise Linux 9.6 Extended Update Support
Via RHSA-2026:6727 https://access.redhat.com/errata/RHSA-2026:6727
---
This is
Wiz
CVE-2026-23732 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 5.5
CVE-2026-23732 [MEDIUM] CVE-2026-23732 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-23732 :
NixOS vulnerability analysis and mitigation
cbData
cx/cy
Source : NVD
## 5.5
Score
Published January 19, 2026
Severity MEDIUM
CNA Score 5.5
Affected Technologies
NixOS
Alma Linux
Has Public Exploit Yes
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 32.9
Exploitation Probability (EPSS) 0.1
Affected packages and libraries
winpr-devel
freerdp-proxy-plugins
Sources
NVD
AlmaLinux 9 Severity HIGH Has Fix Added at: Apr 02, 2026
Alpine 3.10, 3.11, 3.12, 3.13, 3.14, 3.15, 3.16, 3.17, 3.18, 3.19, 3.20, 3.21, 3.22, 3.23 Severity HIGH Has Fix Added at: Jan 29, 2026
Alpine edge Severity HIGH Has Fix Added at: Jan 26, 2026
Chainguard Has Fix Added at: Jan 21, 2026
Debian 11 Severity HIGH
https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/cache/glyph.c#L463-L480https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/codec/color.c#L261-L277https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/core/graphics.c#L138https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/core/orders.c#L2186C17-L2199https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7qxp-j2fj-c3pphttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7qxp-j2fj-c3pp
2026-01-19
Published