CVE-2026-33986

HIGH 7.5

FreeRDP: H.264 YUV Buffer Dimension Desync - Heap OOB Write

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in yuv_ensure_buffer() in libfreerdp/codec/h264.c, h264->width and h264->height are updated before the reallocation loop. If any winpr_aligned_recalloc() call fails, the function returns FALSE but width/height are already inflated. This issue has been patched in version 3.24.2.

CWE	CWE-122 CWE-131
Vendor	freerdp
Product	freerdp
Published	Mar 30, 2026
Last Updated	Jul 15, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

FreeRDP / FreeRDP

< 3.24.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h6qw-wxvm-hf97 github.com: https://github.com/FreeRDP/FreeRDP/commit/f6e43e208958140074ae9bb93cd0c9045a371c77 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-33986 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2453221 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33986.json