CVE-2026-121391
Undergoing Analysis Undergoing Analysis - In Progress

FreeRDP Parallel-Device Redirection Descriptor Leak

Publication date: 2026-11-03

Last updated on: 2026-11-03

Assigner: VulnCheck

Description
FreeRDP from 3.0.0 before 3.32.2 contains a file descriptor leak in parallel_process_irp_create that fails to close previous descriptors on repeated IRP_MJ_CREATE requests. A hostile RDP server with parallel-device redirection enabled can send repeated CREATE requests to exhaust the client descriptor table and crash the process.

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Meta Information

Published
2026-11-03
Last Modified
2026-11-03
Generated
2026-11-03
AI Q&A
2026-11-03
EPSS Evaluated
N/A
NVD
CVE-2026-121391
EUVD
EUVD-2026-115923

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
FreeRDP FreeRDP 3.0.0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-772 The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.

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Executive Summary

CVE-2026-121391 is a file descriptor leak in FreeRDP versions 3.0.0 to 3.32.1. When a user connects to a malicious RDP server with parallel-device redirection enabled, the server sends repeated CREATE requests. The client opens local parallel paths for each request but fails to close previous file descriptors, causing a leak. This exhausts the client's file descriptor table, leading to a crash.

Detection Guidance

Monitor FreeRDP client processes for excessive file descriptor usage. Use commands like 'lsof -p <PID>' to check open descriptors or 'ls /proc/<PID>/fd | wc -l' to count them. High descriptor counts without corresponding legitimate activity may indicate exploitation.

Impact Analysis

The vulnerability can crash the FreeRDP client process due to file descriptor exhaustion. This requires user interaction to connect to a malicious RDP server with parallel-device redirection enabled. The crash is a segmentation fault, not a code execution or memory corruption issue. No system-wide effects beyond the client process are observed.

Mitigation Strategies

Upgrade FreeRDP to version 3.32.2 or later. Disable parallel-device redirection in client configurations if not required. Avoid connecting to untrusted RDP servers until patched.

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