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Vulnerability · Published Mar 30, 2026 · Assigned by GitHub_M

CVE-2026-33983FreeRDP: Progressive Codec Quant BYTE Underflow - UB + CPU DoS

Medium 6.5

In plain English

A medium-severity integer overflow in FreeRDP from FreeRDP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 61.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10freerdp2:3.10.3-5.el10_1.6ALSA-2026:8458
AlmaLinux:8freerdp2:2.11.7-7.el8_10ALSA-2026:8945
AlmaLinux:9freerdp2:2.11.7-1.el9_7.6ALSA-2026:8457
AlmaLinux:10freerdp-devel2:3.10.3-5.el10_1.6ALSA-2026:8458
AlmaLinux:8freerdp-devel2:2.11.7-7.el8_10ALSA-2026:8945
AlmaLinux:9freerdp-devel2:2.11.7-1.el9_7.6ALSA-2026:8457
AlmaLinux:10freerdp-libs2:3.10.3-5.el10_1.6ALSA-2026:8458
AlmaLinux:8freerdp-libs2:2.11.7-7.el8_10ALSA-2026:8945
AlmaLinux:9freerdp-libs2:2.11.7-1.el9_7.6ALSA-2026:8457
AlmaLinux:10freerdp-server2:3.10.3-5.el10_1.6ALSA-2026:8458
AlmaLinux:10libwinpr2:3.10.3-5.el10_1.6ALSA-2026:8458
AlmaLinux:8libwinpr2:2.11.7-7.el8_10ALSA-2026:8945
AlmaLinux:9libwinpr2:2.11.7-1.el9_7.6ALSA-2026:8457
AlmaLinux:10libwinpr-devel2:3.10.3-5.el10_1.6ALSA-2026:8458
AlmaLinux:8libwinpr-devel2:2.11.7-7.el8_10ALSA-2026:8945
AlmaLinux:9libwinpr-devel2:2.11.7-1.el9_7.6ALSA-2026:8457
Alpine:v3.23freerdp3.24.2-r0ALPINE-CVE-2026-33983
Alpine:v3.24freerdp3.24.2-r0ALPINE-CVE-2026-33983
Debian:12freerdp2no fix listedDEBIAN-CVE-2026-33983
Debian:13freerdp33.15.0+dfsg-2.1+deb13u2DEBIAN-CVE-2026-33983
Debian:14freerdp33.24.2+dfsg-1DEBIAN-CVE-2026-33983
Rocky Linux:10freerdp2:3.10.3-5.el10_1.6RLSA-2026:8458
Rocky Linux:8freerdp2:2.11.7-7.el8_10RLSA-2026:8945
Rocky Linux:9freerdp2:2.11.7-1.el9_7.6RLSA-2026:8457
Ubuntu:22.04:LTSfreerdp2no fix listedUBUNTU-CVE-2026-33983
Ubuntu:24.04:LTSfreerdp33.30.0+dfsg-0ubuntu0.24.04.1USN-8561-1
Ubuntu:24.04:LTSfreerdp33.30.0+dfsg-0ubuntu0.24.04.1UBUNTU-CVE-2026-33983
Ubuntu:25.10freerdp3no fix listedUBUNTU-CVE-2026-33983
Ubuntu:26.04:LTSfreerdp33.30.0+dfsg-0ubuntu0.26.04.1USN-8561-1

Affected products (as reported)

VendorProductVersions
FreeRDP FreeRDP < 3.24.2

Weakness: CWE-190, CWE-252 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References