CVE-2026-91960
mediumFreeRDP versions before 3.31.0 contain an integer overflow in WinPR's Stream_EnsureRemainingCapacity function that allows remote attackers to cause denial of s…
Vendor / product: Freerdp — freerdp
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.
CVSS
6.5
6.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (disclosure@vulncheck.com)
Timeline (UTC)
Published: 2026-09-15 16:17
Modified: 2026-09-24 12:17
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-10-27 06:53 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
freerdp / freerdp <3.31.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vccg-35r5-8jrf
Patch / mitigation: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vccg-35r5-8jrf
References
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vccg-35r5-8jrf disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/freerdp-before-3.31.0-integer-overflow-double-free disclosure@vulncheck.com
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vccg-35r5-8jrf 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:53 UTC · record ↗