FreeRDP versions before 3.31.0 contain a heap-based buffer overflow in nego_send_negotiation_request when processing Server Redirection PDU messages with attacker-controlled LoadBalanceInfo fields. A malicious RDP server can trigger the overflow by sending an arbitrary-length field that gets written to a fixed 512-byte buffer without validation, causing client crashes or potential code execution when chained with memory disclosure.
Advisories

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Fixes

Solution

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Workaround

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History

Wed, 16 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


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

Type Values Removed Values Added
Weaknesses CWE-120
References
Metrics threat_severity

None

threat_severity

Important


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

Type Values Removed Values Added
Description FreeRDP versions before 3.31.0 contain a heap-based buffer overflow in nego_send_negotiation_request when processing Server Redirection PDU messages with attacker-controlled LoadBalanceInfo fields. A malicious RDP server can trigger the overflow by sending an arbitrary-length field that gets written to a fixed 512-byte buffer without validation, causing client crashes or potential code execution when chained with memory disclosure.
Title FreeRDP 2.0.0 through 3.30.0 Heap Buffer Overflow via RoutingToken
First Time appeared Freerdp
Freerdp freerdp
Weaknesses CWE-122
CPEs cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*
Vendors & Products Freerdp
Freerdp freerdp
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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: 2026-09-16T15:51:26.906Z

Reserved: 2026-09-15T11:08:44.670Z

Link: CVE-2026-91964

cve-icon Vulnrichment

Updated: 2026-09-16T15:42:38.211Z

cve-icon NVD

Status : Received

Published: 2026-09-15T16:17:52.480

Modified: 2026-09-16T16:17:22.043

Link: CVE-2026-91964

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-15T15:18:17Z

Links: CVE-2026-91964 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-16T03:45:08Z

Weaknesses