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 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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
FreeRDP FreeRDP
< 3.21.0affected
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-32q9-m5qr-9j2v ↗
- 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://access.redhat.com/security/cve/CVE-2026-23533 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2430886 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23533.json ↗
- https://access.redhat.com/errata/RHSA-2026:2714 ↗
- https://access.redhat.com/errata/RHSA-2026:2952 ↗
- https://access.redhat.com/errata/RHSA-2026:2222 ↗
- https://access.redhat.com/errata/RHSA-2026:2081 ↗
- https://access.redhat.com/errata/RHSA-2026:3039 ↗
- https://access.redhat.com/errata/RHSA-2026:3038 ↗
- https://access.redhat.com/errata/RHSA-2026:3036 ↗
- https://access.redhat.com/errata/RHSA-2026:3041 ↗
- https://access.redhat.com/errata/RHSA-2026:2770 ↗
- https://access.redhat.com/errata/RHSA-2026:2824 ↗
- https://access.redhat.com/errata/RHSA-2026:2736 ↗
- https://access.redhat.com/errata/RHSA-2026:3037 ↗
- https://access.redhat.com/errata/RHSA-2026:2048 ↗