CVE-2026-91960

MediumCVSS 6.5/10Last modified Sep 24, 2026

Description

FreeRDP versions before 3.31.0 contain an integer overflow in WinPR's Stream_EnsureRemainingCapacity function that allows remote attackers to cause denial of service. A malicious RD Gateway peer can send a WebSocket Ping frame with a crafted 64-bit extended payload length to trigger integer wraparound, resulting in a double free that crashes the FreeRDP client during connection.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-190

Affected software

Vendor	Product	Versions
FreeRDP	FreeRDP	< 3.31.0

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vccg-35r5-8jrfExploit, Mitigation, Vendor Advisory
https://www.vulncheck.com/advisories/freerdp-before-3.31.0-integer-overflow-double-freeThird Party Advisory
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vccg-35r5-8jrfExploit, Mitigation, Vendor Advisory

Timeline

Published: Sep 15, 2026
Last modified: Sep 24, 2026
NVD status: Analyzed

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