Medium 6.5Published Mar 30, 2026

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

Updated under an hour ago (Oct 27, 2026, 8:50 PM ET)

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Every CVE for FreeRDP

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-190, CWE-252
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

FreeRDP FreeRDP freerdp:freerdp (from the name)	before 3.24.2	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 2:3.10.3-12.el10_2.2 not affected; from 2:3.10.3-5.el10_1.6 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus	from 2:3.10.3-3.el10_0.6 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support redhat:rhel_aus	from 2:2.0.0-46.rc4.el8_2.11 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On redhat:rhel_eus_long_life	from 2:2.2.0-13.el8_4 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service redhat:rhel_tus	from 2:2.2.0-7.el8_6.6 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions redhat:rhel_e4s	from 2:2.2.0-7.el8_6.6 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support redhat:rhel_eus	from 2:2.11.2-1.el9_4.6 not affected	CISA ADP
freerdp freerdp freerdp:freerdp	before 3.24.2	NVD

References

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4gfm-4p52-h478	x-refsource-confirm, patch, vendor-advisory
https://github.com/FreeRDP/FreeRDP/commit/78188ab479c8e6eb9ba2475b3732c76b4bbe5425	x-refsource-misc, patch
https://access.redhat.com/errata/RHSA-2026:10709
https://access.redhat.com/errata/RHSA-2026:11332
https://access.redhat.com/errata/RHSA-2026:11333
https://access.redhat.com/errata/RHSA-2026:11336
https://access.redhat.com/errata/RHSA-2026:11649
https://access.redhat.com/errata/RHSA-2026:11651
https://access.redhat.com/errata/RHSA-2026:12359
https://access.redhat.com/errata/RHSA-2026:12388
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.