Bug 2430887 (CVE-2026-23531) - CVE-2026-23531 freerdp: FreeRDP: Heap buffer overflow via crafted RDPGFX surface updates leads to denial of service and potential code execution.
Summary: CVE-2026-23531 freerdp: FreeRDP: Heap buffer overflow via crafted RDPGFX surf...
Keywords:
Status: NEW
Alias: CVE-2026-23531
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2430904 2430905 2430906 2430908 2430907
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-01-19 18:02 UTC by OSIDB Bzimport
Modified: 2026-01-19 18:27 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-01-19 18:02:17 UTC 
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, in ClearCodec, when `glyphData` is present, `clear_decompress` calls `freerdp_image_copy_no_overlap` without validating the destination rectangle, allowing an out-of-bounds read/write via crafted RDPGFX surface updates. 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.
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