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-2026-55194

CVE-2026-55194HIGH

FreeRDPHeap-buffer-overflow write in TS Gateway RPC RESPONSE reassembly due to alloc_hint capacity mismatch

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   P   H   H   H    8.7   .0062   47.8     —

AFFECTED
  Product  Versions    Fixed
  FreeRDP  < 3.27.0 –  —

TIMELINE
  Jun 16  Reserved by GitHub_M
  Aug 19  Published (CNA: GitHub_M)
  Sep 24  EXPLOIT PUBLISHED — CVE-2026-55194 (FreeRDP). Public exploit reference added.

CWE-122 · CNA: GitHub_M · CVSS v4.0 · 4 references · NVD status: Analyzed

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.0, rpc_client_recv_fragment in libfreerdp/core/gateway/rpc_client.c ensures the response reassembly stream capacity using only the server-declared alloc_hint rather than the actual StubLength about to be written. A malicious TS Gateway can send a PTYPE_RESPONSE with a small alloc_hint and a much larger frag_length, causing Stream_Write to copy attacker-controlled stub data beyond the 4096-byte pdu->s buffer. This can crash the client and may permit code execution through heap corruption. This issue is fixed in version 3.27.0.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 16, 2026	Reserved	Reserved by GitHub_M
August 19, 2026	Published	Published (CNA: GitHub_M)
September 24, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-55194 (FreeRDP). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
FreeRDP	FreeRDP	—	< 3.27.0	—

Weaknesses

CWE-122

References (4)

https://github.com/FreeRDP/FreeRDP/commit/9f2da52c2341cc14a96ad12e69c5b83d0bcd8b5a [Patch]
https://github.com/FreeRDP/FreeRDP/pull/12873 [Issue Tracking, Patch]
https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.0 [Release Notes]
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9gxm-3mf5-f5cx [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-55194 at cve.org

Vendors: freerdp

Weaknesses: CWE-122

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-55194 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.