CVE-2026-91964

FreeRDP 2.0.0 through 3.30.0 Heap Buffer Overflow via RoutingToken

State: Published
Severity: 8.7 High
Published: Sep 15, 2026
Updated: Sep 16, 2026
Reserved: Sep 15, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	VulnCheck
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-122 Heap-based Buffer Overflow

Affected Products

Product	Versions
FreeRDPFreeRDP	2.0.0 to before 3.0.0Affected 3.0.0 to before 3.31.0Affected 3.31.0Not affected
FreeRDPFreeRDP	before 3.31.0Affected 3.31.0Not affected

References

GitHub Security Advisory (GHSA-2vf2-grvj-6g8x)vendor-advisory
VulnCheck Advisory: FreeRDP 2.0.0 through 3.30.0 Heap Buffer Overflow via RoutingTokenthird-party-advisory

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