CVE-2026-23532

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 FreeRDP client’s `gdi_SurfaceToSurface` path due to a mismatch between destination rectangle clamping and the actual copy size. 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.

References

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23532.json

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fq8c-87hj-7gvr

https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0

https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/gdi/gfx.c#L1368-L1382

https://bugzilla.redhat.com/show_bug.cgi?id=2430891

https://access.redhat.com/security/cve/CVE-2026-23532

https://access.redhat.com/errata/RHSA-2026:3041

https://access.redhat.com/errata/RHSA-2026:3039

https://access.redhat.com/errata/RHSA-2026:3038

https://access.redhat.com/errata/RHSA-2026:3037

https://access.redhat.com/errata/RHSA-2026:3036

https://access.redhat.com/errata/RHSA-2026:2952

https://access.redhat.com/errata/RHSA-2026:2824

https://access.redhat.com/errata/RHSA-2026:2770

https://access.redhat.com/errata/RHSA-2026:2736

https://access.redhat.com/errata/RHSA-2026:2714

https://access.redhat.com/errata/RHSA-2026:2222

https://access.redhat.com/errata/RHSA-2026:2081

https://access.redhat.com/errata/RHSA-2026:2048

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS