Heap-based buffer overflow in FreeRDP - CVE-2026-33984

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Main Vulnerability Database Vulnerabilities #VU125370

Heap-based buffer overflow in FreeRDP - CVE-2026-33984

Published: April 8, 2026


Vulnerability identifier: #VU125370
CSH Severity: Medium
CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-33984
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to a heap-based buffer overflow in resize_vbar_entry() in libfreerdp/codec/clear.c when processing ClearCodec band data from a malicious RDP server. A remote attacker can send crafted ClearCodec band data to execute arbitrary code.

User interaction is required to connect to a malicious RDP server, and exploitation depends on realloc failure under memory pressure.


Affected software

FreeRDP
Red Hat Enterprise Linux for IBM z Systems
Anolis OS
Red Hat CodeReady Linux Builder for IBM z Systems
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
openEuler
Fedora
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
freerdp (Red Hat package)
freerdp-doc
libwinpr-devel
libwinpr
freerdp-libs
freerdp-devel
freerdp
freerdp-debuginfo
freerdp-debugsource
freerdp-help

How to mitigate CVE-2026-33984

Install security update from vendor's website.

FreeRDP - update to 3.24.2
freerdp (Red Hat package) - addressed in versions 2.0.0-46.rc4.el8_2.11, 2.2.0-7.el8_6.6, 2.2.0-12.el8_8.6, 2.2.0-13.el8_4, 2.4.1-3.el9_0.5, 2.4.1-6.el9_2.7, 2.11.7-1.el9_6.8, 2.11.7-1.el9_7.6, 2.11.7-7.el8_10, 3.10.3-3.el10_0.6, 3.10.3-5.el10_1.6
freerdp-doc - update to 2.11.7-7.0.1
libwinpr-devel - update to 2.11.7-7.0.1
libwinpr - update to 2.11.7-7.0.1
freerdp-libs - update to 2.11.7-7.0.1
freerdp-devel - update to 2.11.7-7.0.1
freerdp - update to 2.11.7-7.0.1
libwinpr - update to 2.11.8-3
freerdp - update to 2.11.8-3
libwinpr-devel - update to 2.11.8-3
freerdp-debuginfo - update to 2.11.8-3
freerdp-debugsource - update to 2.11.8-3
freerdp-devel - update to 2.11.8-3
freerdp-help - update to 2.11.8-3
freerdp - addressed in versions 3.24.2-1.fc42, 3.24.2-1.fc43, 3.24.2-1.fc44

External References

Related Security Bulletins