CVE-2026-23948 FreeRDP has a NULL Pointer Dereference in rdp_write_logon_info_v2()
A malicious RDP server can crash the FreeRDP proxy by sending a crafted LogonInfoV2 PDU with zero-length domain or username fields.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23948?
CVE-2026-23948 is a medium-severity vulnerability in Freerdp Freerdp, published on 9 Feb 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 3.22.0, a NULL pointer dereference vulnerability in rdp_write_logon_info_v2() allows a malicious RDP server to crash FreeRDP proxy by sending a specially crafted LogonInfoV2 PDU with cbDomain=0 or cbUserName=0. This vulnerability is fixed in 3.22.0.
Weakness: CWE-476
Which versions are affected by CVE-2026-23948?
It affects 1 product.
Products include Freerdp Freerdp.
How do I fix CVE-2026-23948?
Upgrade to a fixed version.
Is CVE-2026-23948 being exploited?
There is no known exploitation of CVE-2026-23948 in the wild and no public exploit code.
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-2026-23948, GHSA-6f3c-qvqq-2px5, OESA-2026-2721, UBUNTU-CVE-2026-23948.