CVE-2026-23534
FreeRDP has heap-buffer-overflow in clear_decompress_bands_data
- State
- Published
- Severity
- 7.7 High
- Published
- Jan 19, 2026
- Updated
- Jul 15, 2026
- Reserved
- Jan 13, 2026
Description
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 ClearCodec bands decode path when crafted band coordinates allow writes past the end of the destination surface buffer. 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.7 High | 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 | GitHub_M |
| 3.1 | 7.6 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H | redhat-SADP |
Weaknesses
- CWE-122 Heap-based Buffer Overflow
Affected Products
| Product | Versions |
|---|---|
FreeRDPFreeRDP |
|
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3frr-mp8w-4599
- https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L878-L879
- https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L883-L884
- https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0
- https://access.redhat.com/security/cve/CVE-2026-23534vdb-entry
- RHBZ#2430888issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23534.json
- https://access.redhat.com/errata/RHSA-2026:2952vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:2222vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:2081vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:2736vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:3037vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:2048vendor-advisory
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.