# CVE-2026-91953

## Summary

- **CVE ID:** CVE-2026-91953
- **Severity:** HIGH
- **CVSS Score:** 7.1 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-120
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## Description

FreeRDP versions before 3.31.0 contain a heap buffer overflow vulnerability in nego_send_negotiation_request() that fails to validate the LB_LOAD_BALANCE_INFO field length before writing to a fixed 512-byte buffer. A malicious RDP server or man-in-the-middle can send a Server Redirection PDU with an oversized LB_LOAD_BALANCE_INFO value to overflow the buffer with attacker-controlled content, causing denial of service or heap corruption before authentication completes.

## Affected Products

- FreeRDP — FreeRDP (0)
- FreeRDP — FreeRDP (3.31.0)

## References

- [CNA](https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-r9pv-ffph-6gg6)
- [CNA](https://www.vulncheck.com/advisories/freerdp-before-3.31.0-heap-buffer-overflow-via-lb-load-balance-info)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.42%
- **EPSS Percentile:** 35.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._