CVE-2026-33983CWE-190CWE-252

FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS

Medium · published March 30, 2026

CVSS v3.1
6.5
EPSS
1%
Percentile
56.1
In the wild
Unconfirmed
What it is

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, progressive_decompress_tile_upgrade() detects a mismatch via progressive_rfx_quant_cmp_equal() but only emits WLog_WARN, execution continues. The wrapped value (247) is used as a shift exponent, causing undefined behavior and an approximately 80 billion iteration loop (CPU DoS). This issue has been patched in version 3.24.2.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00798 · 56.1th percentile
Weaknesses
CWE-190 · Integer Overflow or Wraparound; CWE-252 · Unchecked Return Value
Published
2026-03-30T21:42Z
EPSS history
Timeline
  • 30 MAR 21:42Z
    FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS
    cvelistv5