What’s Vulnerable › Vulnerabilities

CVE-2026-91964: FreeRDP 2.0.0 through 3.30.0 Heap Buffer Overflow via RoutingToken

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-24
• Weakness: CWE-122

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.

Affected products

• FreeRDP: from 2.0.0 before 3.0.0; from 3.0.0 before 3.31.0; before 3.31.0 — fixed in 3.0.0, 3.31.0

How to fix

Upgrade to a fixed version: FreeRDP 3.0.0, 3.31.0. Check the vendor advisory for mitigations.

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2vf2-grvj-6g8x
• https://www.vulncheck.com/advisories/freerdp-2.0.0-through-3.30.0-heap-buffer-overflow-via-routingtoken

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