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CVE

CVE-2026-23533

FreeRDP has heap-buffer-overflow in clear_decompress_residual_data
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CVE

CVE-2026-23533

FreeRDP has heap-buffer-overflow in clear_decompress_residual_data

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.7
-
4.0
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L268-L281, https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L336, https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23533.json, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-32q9-m5qr-9j2v, https://nvd.nist.gov/vuln/detail/CVE-2026-23533

Severity

0

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
0
EPSS Probability
0.00154%
EPSS Percentile
0.36193%
Introduced Version
0
Fix Available
6f5d0048f006a2d2ffc9b9fa05f0e98db464c5a4,2:2.11.7-2.el8_10,2:2.11.7-1.el9_7.1,0:2.11.5+dfsg1-1ubuntu0.1~esm3,0:3.5.1+dfsg1-0ubuntu1.4,0:2.2.0+dfsg1-0ubuntu0.18.04.4+esm3,0:2.6.1+dfsg1-0ubuntu0.20.04.2+esm1,0:2.6.1+dfsg1-3ubuntu2.8,3.22.0-r0,0:2.1.1-5.0.1.el7_9,2:2.11.7-1.amzn2.0.3,2:3.6.3-1.amzn2023.0.2

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