High 7.7Published Jan 19, 2026

CVE-2026-23533FreeRDP has heap-buffer-overflow in clear_decompress_residual_data

Updated under an hour ago (Oct 27, 2026, 11:30 AM ET)

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It affects FreeRDP and 8 other products. Add what you run to find out whether that includes you.

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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 3.21.0, a client-side heap buffer overflow occurs in the RDPGFX ClearCodec decode path when maliciously crafted residual data causes out-of-bounds writes during color output. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.

CVSS: 7.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P
Weakness (CWE): CWE-122
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 3.21.0	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 2:3.10.3-5.el10_1.1 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_0.1 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support redhat:rhel_els	from 0:2.1.1-5.el7_9.1 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_2.6 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 2:2.2.0-7.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_6.1 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_6.1 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_4.1 not affected	CISA ADP
freerdp freerdp freerdp:freerdp	before 3.21.0	NVD

References

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-32q9-m5qr-9j2v	x-refsource-confirm, exploit, vendor-advisory
https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L268-L281	x-refsource-misc, product
https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L336	x-refsource-misc, product
https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0	x-refsource-misc, release-notes
https://access.redhat.com/errata/RHSA-2026:2048
https://access.redhat.com/errata/RHSA-2026:2081
https://access.redhat.com/errata/RHSA-2026:2222
https://access.redhat.com/errata/RHSA-2026:2714
https://access.redhat.com/errata/RHSA-2026:2736
https://access.redhat.com/errata/RHSA-2026:2770
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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.