VULNERABILITY INTELLIGENCE

CVE-2026-33984

CVSS score7.5 HIGH
EPSS probability0.40%
CISA KEVNot currently listed
Published2026-03-30
Last modified2026-07-15
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in resize_vbar_entry() in libfreerdp/codec/clear.c, vBarEntry->size is updated to vBarEntry->count before the winpr_aligned_recalloc() call. If realloc fails, size is inflated while pixels still points to the old, smaller buffer. On a subsequent call where count <= size (the inflated value), realloc is skipped. The caller then writes count * bpp bytes of attacker-controlled pixel data into the undersized buffer, causing a heap buffer overflow. This issue has been patched in version 3.24.2.

Weakness classification

  • security-advisories@github.com: CWE-122
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-131

Primary references