CVE-2026-91954

FreeRDP before 3.31.0 contains a null pointer dereference vulnerability in gdi_surface_bits when processing Surface Bits commands with NSCodec codec ID. A malicious RDP server can crash a FreeRDP client by sending a crafted Surface Bits command claiming to use NSCodec, even when the codec is disabled.

Scoring

Severity

HIGH

CVSS base score

7.1

CVSS vector

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

EPSS probability

0.35%

CWE

CWE-476

Published

2026-09-15

Last modified

2026-09-17

Affected products

• FreeRDP FreeRDP
• FreeRDP FreeRDP

Weakness type

• CWE-476

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• CVE-2026-60109 — Zeek < 8.0.9 Null Pointer Dereference DoS via Kerberos KRB_ERROR Parsing
• CVE-2026-67304 — FreeRDP before 3.29.0 NULL Dereference via smartcard cleanup
• CVE-2026-67288 — FreeRDP before 3.29.0 Denial of Service via smartcard cache
• CVE-2026-55204 — HAProxy - NULL Pointer Dereference in hpack_dht_insert Function
• CVE-2026-13084 — Null Pointer Dereference in WatchGuard Fireware OS iked Process

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