Remote Desktop Protocol Vulnerability in FreeRDP by FreeRDP
CVE-2026-55194

8.7HIGH

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
19 August 2026

What is CVE-2026-55194?

The FreeRDP vulnerability arises from improper handling of response reassembly stream capacity in the Remote Desktop Protocol. An untrusted TS Gateway can exploit this flaw by sending a PTYPE_RESPONSE with a smaller alloc_hint, as compared to a larger frag_length. This discrepancy allows attackers to write beyond the intended buffer size, resulting in heap corruption that can crash the FreeRDP client and potentially enable arbitrary code execution. The issue is remediated in version 3.27.0.

Affected Version(s)

FreeRDP < 3.27.0

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/FreeRDP/FreeRDP/pull/12873
x_refsource_MISC
https://github.com/FreeRDP/FreeRDP/commit/9f2da52c2341cc1...
x_refsource_MISC

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.