What is CVE-2026-23948?

CVE-2026-23948 is a high-severity vulnerability in Freerdp, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-02-09.

How severe is CVE-2026-23948?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Freerdp

CVE-2026-23948

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.

Published 2026-02-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.005 (40.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000

Affected products

Freerdp — versions < 3.22.0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6f3c-qvqq-2px5 (Patch, Vendor Advisory)
github.com/FreeRDP/FreeRDP/commit/4d44e3c097656a8b9ec696353647b0888ca45860 (Patch)

Frequently asked questions

What is CVE-2026-23948?: CVE-2026-23948 is a high-severity vulnerability in Freerdp, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-02-09.
How severe is CVE-2026-23948?: High severity. CVSS v3 base score is 7.5 out of 10.