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-2026-91953

CVE-2026-91953HIGH

FreeRDP before 3.31.0 Heap Buffer Overflow via LB_LOAD_BALANCE_INFO

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   P   N   N   H    7.1   .0046   37.5     —

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-2026-91953 (FreeRDP). Public exploit reference added.

CWE-120 · CNA: VulnCheck · CVSS v4.0 · 2 references · NVD status: Analyzed

Description

FreeRDP versions before 3.31.0 contain a heap buffer overflow vulnerability in nego_send_negotiation_request() that fails to validate the LB_LOAD_BALANCE_INFO field length before writing to a fixed 512-byte buffer. A malicious RDP server or man-in-the-middle can send a Server Redirection PDU with an oversized LB_LOAD_BALANCE_INFO value to overflow the buffer with attacker-controlled content, causing denial of service or heap corruption before authentication completes.

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-2026-91953 (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-120

References (2)

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-r9pv-ffph-6gg6 [Exploit, Mitigation, Vendor Advisory]
https://www.vulncheck.com/advisories/freerdp-before-3.31.0-heap-buffer-overflow-via-lb-load-balance-info [Third Party Advisory]

Authoritative record: CVE-2026-91953 at cve.org

Vendors: freerdp

Weaknesses: CWE-120

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-91953 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.