Unrated severityOSV Advisory· Published Jan 19, 2026· Updated Jan 20, 2026
FreeRDP has heap-buffer-overflow in clear_decompress
CVE-2026-23531
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
21- osv-coords19 versionspkg:apk/chainguard/freerdp-devpkg:apk/wolfi/freerdp-devpkg:rpm/almalinux/freerdppkg:rpm/almalinux/freerdp-develpkg:rpm/almalinux/freerdp-libspkg:rpm/almalinux/freerdp-serverpkg:rpm/almalinux/libwinprpkg:rpm/almalinux/libwinpr-develpkg:rpm/opensuse/freerdp2&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/freerdp2&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/freerdp&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/freerdp&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/freerdp&distro=openSUSE%20Tumbleweedpkg:rpm/suse/freerdp2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP7pkg:rpm/suse/freerdp2&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP7pkg:rpm/suse/freerdp&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP7pkg:rpm/suse/freerdp&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5-LTSSpkg:rpm/suse/freerdp&distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5pkg:rpm/suse/freerdp&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP7
< 2.11.7-r9+ 18 more
- (no CPE)range: < 2.11.7-r9
- (no CPE)range: < 2.11.7-r9
- (no CPE)range: < 2:2.11.7-1.el9_7.1
- (no CPE)range: < 2:2.11.7-1.el9_7.1
- (no CPE)range: < 2:2.11.7-1.el9_7.1
- (no CPE)range: < 2:3.10.3-5.el10_1.1
- (no CPE)range: < 2:2.11.7-1.el9_7.1
- (no CPE)range: < 2:2.11.7-1.el9_7.1
- (no CPE)range: < 2.11.7-bp160.2.1
- (no CPE)range: < 2.11.7-4.1
- (no CPE)range: < 2.11.2-150600.4.6.1
- (no CPE)range: < 3.22.0-160000.1.1
- (no CPE)range: < 3.21.0-1.1
- (no CPE)range: < 2.11.7-150700.3.3.1
- (no CPE)range: < 2.11.7-150700.3.3.1
- (no CPE)range: < 2.11.2-150600.4.6.1
- (no CPE)range: < 2.1.2-12.52.1
- (no CPE)range: < 2.1.2-12.52.1
- (no CPE)range: < 3.10.3-150700.3.3.1
Patches
Vulnerability mechanics
References
3- github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.cmitrex_refsource_MISC
- github.com/FreeRDP/FreeRDP/releases/tag/3.21.0mitrex_refsource_MISC
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-xj5h-9cr5-23c5mitrex_refsource_CONFIRM
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