CVE-2026-91960

EUVD-2026-78636
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
6.5 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
freerdpfreerdp
𝑥
< 3.31.0
CNA
Debian logo
Debian Releases
Debian Product
Codename
freerdp2
bookworm
2.11.7+dfsg1-6~deb12u1
fixed
freerdp3
forky
3.31.1+dfsg-1
fixed
sid
3.31.1+dfsg-1
fixed
trixie
3.15.0+dfsg-2.1+deb13u3
fixed
Common Weakness Enumeration
References
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vccg-35r5-8jrf
https://www.vulncheck.com/advisories/freerdp-before-3.31.0-integer-overflow-double-free
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-vccg-35r5-8jrf