Remote Desktop Protocol Implementation Flaw in FreeRDP
CVE-2026-33986

7.5HIGH

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
30 March 2026

What is CVE-2026-33986?

A buffer management issue exists in FreeRDP's implementation of the Remote Desktop Protocol prior to version 3.24.2. Specifically, within the function yuv_ensure_buffer() in libfreerdp/codec/h264.c, the height and width parameters are updated prematurely before the memory reallocation loop. If a winpr_aligned_recalloc() function call fails, the function will return FALSE but the height and width values will have already been inflated, potentially leading to unintended behavior. This vulnerability has been addressed and patched in version 3.24.2, ensuring that the height and width values only reflect valid allocations.

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Affected Version(s)

FreeRDP < 3.24.2

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/commit/f6e43e208958140...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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