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Heap-based Buffer Overflow Affecting freerdp3 package, versions <3.27.0+dfsg-1

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.63% (48th percentile)

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  • Snyk IDSNYK-DEBIAN14-FREERDP3-17882060
  • published8 Jul 2026
  • disclosed19 Aug 2026
Report a new vulnerability Found a mistake?

Introduced: 8 Jul 2026

CVE-2026-55194  (opens in a new tab)
CWE-122  (opens in a new tab)

How to fix?

Upgrade Debian:14 freerdp3 to version 3.27.0+dfsg-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream freerdp3 package and not the freerdp3 package as distributed by Debian. See How to fix? for Debian:14 relevant fixed versions and status.

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.