# CVE-2026-91964

## Summary

- **CVE ID:** CVE-2026-91964
- **Severity:** HIGH
- **CVSS Score:** 8.8 (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)
- **CWE:** CWE-122
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 16, 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.

## Affected Products

- FreeRDP — FreeRDP (2.0.0)
- FreeRDP — FreeRDP (3.0.0)
- FreeRDP — FreeRDP (3.31.0)
- FreeRDP — FreeRDP (0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.55%
- **EPSS Percentile:** 44.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._