Freerdp: Heap-buffer-overflow write in AVC444 YUV buffer allocation (CVE-2026-55191)
A heap-buffer-overflow vulnerability exists in FreeRDP related to AVC444 YUV buffer allocation. This flaw could allow an attacker to cause a crash, resulting in denial of service, or potentially execute arbitrary code. Multiple versions of FreeRDP are affected. Ubuntu has released patches addressing this issue in updated package versions for various supported releases.
AI Analysis
Technical Summary
CVE-2026-55191 is a heap-buffer-overflow write vulnerability in the AVC444 YUV buffer allocation component of FreeRDP. This vulnerability can lead to memory corruption, which may be exploited to cause application crashes or arbitrary code execution. The issue affects multiple specific versions of FreeRDP, including numerous Ubuntu package versions. Ubuntu's security advisory USN-8561-1 confirms the vulnerability and provides updated package versions that fix the issue.
Potential Impact
An attacker could exploit this heap-buffer-overflow vulnerability to cause FreeRDP to crash, resulting in denial of service, or potentially execute arbitrary code. The vulnerability also poses a risk of sensitive information disclosure. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available. Users should update FreeRDP to the patched versions provided by Ubuntu in security notice USN-8561-1. Applying standard system updates will install the necessary patches. No additional mitigation steps are required beyond updating to the fixed package versions.
Freerdp: Heap-buffer-overflow write in AVC444 YUV buffer allocation (CVE-2026-55191)
Description
A heap-buffer-overflow vulnerability exists in FreeRDP related to AVC444 YUV buffer allocation. This flaw could allow an attacker to cause a crash, resulting in denial of service, or potentially execute arbitrary code. Multiple versions of FreeRDP are affected. Ubuntu has released patches addressing this issue in updated package versions for various supported releases.
CVSS v4.0
Affected software
pkg:deb/ubuntu/[email protected]~git20140921.1.440916e+dfsg1-5ubuntu1.4?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]+dfsg1-0ubuntu0.18.04.4+esm6?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~git20140921.1.440916e+dfsg1-15ubuntu1.18.04.2?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]+dfsg1-0ubuntu0.20.04.2+esm4?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]+dfsg1-3ubuntu2.11?arch=source&distro=jammypkg:deb/ubuntu/[email protected]+dfsg-0ubuntu0.24.04.1?arch=source&distro=noblepkg:deb/ubuntu/[email protected]+dfsg1-1ubuntu0.1~esm6?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/[email protected]+dfsg-2ubuntu0.5?arch=source&distro=questingpkg:deb/ubuntu/[email protected]+dfsg-0ubuntu0.26.04.1?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-55191 is a heap-buffer-overflow write vulnerability in the AVC444 YUV buffer allocation component of FreeRDP. This vulnerability can lead to memory corruption, which may be exploited to cause application crashes or arbitrary code execution. The issue affects multiple specific versions of FreeRDP, including numerous Ubuntu package versions. Ubuntu's security advisory USN-8561-1 confirms the vulnerability and provides updated package versions that fix the issue.
Potential Impact
An attacker could exploit this heap-buffer-overflow vulnerability to cause FreeRDP to crash, resulting in denial of service, or potentially execute arbitrary code. The vulnerability also poses a risk of sensitive information disclosure. There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available. Users should update FreeRDP to the patched versions provided by Ubuntu in security notice USN-8561-1. Applying standard system updates will install the necessary patches. No additional mitigation steps are required beyond updating to the fixed package versions.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-55191
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5e7a702a4a8d59899de95b
Added to database: 07/20/2026, 19:43:44 UTC
Last enriched: 08/21/2026, 17:16:23 UTC
Last updated: 08/30/2026, 10:52:09 UTC
Views: 37
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