Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-66401

CVE-2026-66401LOW

FreeRDP before 3.29.0 Out-of-Bounds Read via UVC H.264

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   P   L   N   N   P   N   N   L    2.4   .0020    9.0     —

AFFECTED
  Product  Versions     Fixed
  FreeRDP  unspecified  3.29.0

TIMELINE
  Jul 26  Reserved by VulnCheck
  Aug 1   Published (CNA: VulnCheck)
  Sep 3   EXPLOIT PUBLISHED — CVE-2026-66401 (FreeRDP). Public exploit reference added.

CWE-125 · CNA: VulnCheck · CVSS v4.0 · 3 references · NVD status: Analyzed

Description

FreeRDP before 3.29.0 contains an out-of-bounds heap read vulnerability in the UVC H.264 extension-unit parser that fails to validate descriptor length before accessing the GUID field. A local attacker with a malicious USB video camera can trigger a heap read beyond allocated bounds during camera stream setup, causing denial of service.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 26, 2026	Reserved	Reserved by VulnCheck
August 1, 2026	Published	Published (CNA: VulnCheck)
September 3, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-66401 (FreeRDP). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
FreeRDP	FreeRDP	—	—	3.29.0

Weaknesses

CWE-125

References (3)

https://github.com/FreeRDP/FreeRDP/commit/5044d5390035c6fd9a36ad885192d97d21e8a92d [Patch]
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8jj2-67pg-j6mg [Exploit, Patch, Vendor Advisory]
https://www.vulncheck.com/advisories/freerdp-before-out-of-bounds-read-via-uvc-h-264 [Patch, Third Party Advisory]

Authoritative record: CVE-2026-66401 at cve.org

Vendors: freerdp

Weaknesses: CWE-125

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-66401 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 Sunday, October 4, 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.