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CVE-2026-33986

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

Published: Mar 30, 2026Updated: Apr 1, 2026 Sources: CVE List NVD BDUCWE-122
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.2%
Top 87.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:RS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-122CWE-131

Affected Products

FreeRDPFreeRDPOSS Libraries
freerdpfreerdpOSS Libraries
АЛЬТ СП 10АО «ИВК»
On-premOS
Operating Systems / linux-distro
FreeRDPFree Software Foundation, Inc.OSS Libraries
freerdposs-projectUSOSS Libraries
ао «ивк»commercialRUOperating Systemsaka ivk
free software foundation, inc.oss-projectUSOSS Librariesaka fsf, free software foundation

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h6qw-wxvm-hf97
github.com
https://github.com/FreeRDP/FreeRDP/commit/f6e43e208958140074ae9bb93cd0c9045a371c77
github.com
https://altsp.su/obnovleniya-bezopasnosti/
altsp.su

Timeline

Published
Mar 30, 2026
Last Updated
Apr 1, 2026

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