CVE-2026-23732 FreeRDP has heap-buffer-overflow in Glyph_Alloc
A malicious RDP server can trigger a heap buffer overflow in FreeRDP clients, causing a crash and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23732?
CVE-2026-23732 is a medium-severity memory corruption vulnerability in Freerdp Freerdp, published on 19 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-122
Which versions are affected by CVE-2026-23732?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-23732?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-23732 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-23732 exists.
Other vulnerabilities in Freerdp Freerdp
- CVE-2021-37594 Other in n/a
- CVE-2021-37595 Other in n/a
- CVE-2026-67305 FreeRDP Windows Client before 3.29.0 Heap Buffer Overflow via Cliprdr
- CVE-2026-66402 FreeRDP before 3.29.0 TLS Certificate Identity Validation Bypass
- CVE-2026-67289 FreeRDP before 3.29.0 HTTP Proxy Request Injection via Redirection
Sources
Also known as DEBIAN-CVE-2026-23732, GHSA-7qxp-j2fj-c3pp, UBUNTU-CVE-2026-23732.