CVE-2026-91950 FreeRDP before 3.31.0 Out-of-Bounds Read via UINT32 Wraparound
A malicious RDP server can trigger an out-of-bounds read via integer wraparound, causing client crashes or heap disclosure in FreeRDP.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-91950?
CVE-2026-91950 is a high-severity vulnerability in Freerdp Freerdp, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
FreeRDP before 3.31.0 contains an out-of-bounds read vulnerability in the rdpdr_dump_packet function due to 32-bit unsigned integer wraparound in buffer bounds validation. A malicious RDP server can send a crafted RDPDR packet with computerNameLen set to 0xFFFFFFF0 to bypass bounds checks and trigger memory reads past the packet buffer, causing client crashes or heap disclosure in logs.
Weakness: CWE-125
Which versions are affected by CVE-2026-91950?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-91950?
Upgrade to a fixed version.
Is CVE-2026-91950 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91950 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-2026-91950, GHSA-858j-6g95-r29w, GHSA-c5gr-hmqp-pwj4, UBUNTU-CVE-2026-91950.