CVE-2026-33983

MEDIUM 6.5

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

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-190 CWE-252
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:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

FreeRDP / FreeRDP

< 3.24.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗