CVE-2026-23531
FreeRDP has heap-buffer-overflow in clear_decompress
CVSS Score
7.6
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-122 |
| Vendor | freerdp |
| Product | freerdp |
| Published | Jan 19, 2026 |
| Last Updated | Jun 30, 2026 |
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Affected Versions
FreeRDP / FreeRDP
< 3.21.0
References
github.com: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-xj5h-9cr5-23c5 github.com: https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L1139-L1145 github.com: https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-23531 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2430887 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23531.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2714 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2952 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2222 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2081 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:3039 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:3038 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:3036 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:3041 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2770 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2824 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2736 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:3037 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2048