FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in server-side static virtual channel handling when CHANNEL_OPTION_SHOW_PROTOCOL is enabled. Authenticated clients can queue oversized channel messages that cause buffer underflow and corrupt heap memory including live pointers, potentially enabling code execution.

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Solution

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History

Wed, 16 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-124
References
Metrics threat_severity

None

threat_severity

Important


Tue, 15 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 15 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Description FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in server-side static virtual channel handling when CHANNEL_OPTION_SHOW_PROTOCOL is enabled. Authenticated clients can queue oversized channel messages that cause buffer underflow and corrupt heap memory including live pointers, potentially enabling code execution.
Title FreeRDP before 3.31.0 Out-of-bounds Write via SHOW_PROTOCOL
First Time appeared Freerdp
Freerdp freerdp
Weaknesses CWE-191
CPEs cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*
Vendors & Products Freerdp
Freerdp freerdp
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 7.7, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-15T16:03:29.434Z

Reserved: 2026-09-15T11:07:01.913Z

Link: CVE-2026-91948

cve-icon Vulnrichment

Updated: 2026-09-15T16:02:28.419Z

cve-icon NVD

Status : Received

Published: 2026-09-15T16:17:48.503

Modified: 2026-09-15T17:17:41.080

Link: CVE-2026-91948

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-15T15:18:06Z

Links: CVE-2026-91948 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-16T03:15:06Z

Weaknesses