CVE-2026-23732 | THREATINT

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.

PUBLISHED Reserved 2026-01-15 | Published 2026-01-19 | Updated 2026-01-20 | Assigner GitHub_M

MEDIUM: 5.5CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

Problem types

CWE-122: Heap-based Buffer Overflow

Product status

< 3.21.0

affected

References

github.com/...reeRDP/security/advisories/GHSA-7qxp-j2fj-c3pp exploit

github.com/...reeRDP/security/advisories/GHSA-7qxp-j2fj-c3pp

github.com/...2a4e36a14978b561f00ea/libfreerdp/cache/glyph.c

github.com/...2a4e36a14978b561f00ea/libfreerdp/codec/color.c

github.com/...4e36a14978b561f00ea/libfreerdp/core/graphics.c

github.com/...2a4e36a14978b561f00ea/libfreerdp/core/orders.c

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

cve.org (CVE-2026-23732)

nvd.nist.gov (CVE-2026-23732)

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