Unrated severityOSV Advisory· Published Jan 19, 2026· Updated Jan 20, 2026
FreeRDP has heap-buffer-overflow in Glyph_Alloc
CVE-2026-23732
Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, FastGlyph parsing trusts cbData/remaining length and never validates against the minimum size implied by cx/cy. A malicious server can trigger a client‑side global buffer overflow, causing a crash (DoS). Version 3.21.0 contains a patch for the issue.
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
6- github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/cache/glyph.cmitrex_refsource_MISC
- github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/codec/color.cmitrex_refsource_MISC
- github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/core/graphics.cmitrex_refsource_MISC
- github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/core/orders.cmitrex_refsource_MISC
- github.com/FreeRDP/FreeRDP/releases/tag/3.21.0mitrex_refsource_MISC
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7qxp-j2fj-c3ppmitrex_refsource_CONFIRM
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