Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-91954

CVE-2026-91954HIGH

FreeRDP before 3.31.0 NULL Pointer Dereference via NSCodec

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   P   N   N   H    7.1   .0038   29.7     —

AFFECTED
  Product  Versions     Fixed
  FreeRDP  unspecified  3.31.0

TIMELINE
  Sep 15  Reserved by VulnCheck
  Sep 15  Published (CNA: VulnCheck)
  Sep 24  EXPLOIT PUBLISHED — CVE-2026-91954 (FreeRDP). Public exploit reference added.

CWE-476 · CNA: VulnCheck · CVSS v4.0 · 2 references · NVD status: Analyzed

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 15, 2026	Reserved	Reserved by VulnCheck
September 15, 2026	Published	Published (CNA: VulnCheck)
September 24, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-91954 (FreeRDP). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
FreeRDP	FreeRDP	—	—	3.31.0

Weaknesses

CWE-476

References (2)

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-ffjr-p229-hpch [Exploit, Mitigation, Vendor Advisory]
https://www.vulncheck.com/advisories/freerdp-before-3.31.0-null-pointer-dereference-via-nscodec [Third Party Advisory]

Authoritative record: CVE-2026-91954 at cve.org

Vendors: freerdp

Weaknesses: CWE-476

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-91954 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.