CVE-2026-91949

EUVD-2026-78806
FreeRDP server versions before 3.31.0 contain a protocol negotiation bypass vulnerability that allows unauthenticated attackers to establish RDSTLS connections despite server policy disabling them. Attackers can send incompatible protocol requests, receive negotiation failures, then complete TLS handshake and enter RDSTLS to bypass pre-authentication transport restrictions.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.3 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 47.57%
Affected Products (NVD)
VendorProductVersion
freerdpfreerdp
3.0.0 ≤
𝑥
< 3.31.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
freerdp2
bookworm
2.11.7+dfsg1-6~deb12u1
fixed
freerdp3
forky
3.32.2+dfsg-1
fixed
sid
3.32.2+dfsg-1
fixed
trixie
vulnerable
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
freerdp
bionic
needs-triage
jammy
dne
noble
dne
resolute
dne
xenial
needs-triage
freerdp2
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
dne
freerdp3
jammy
dne
noble
Fixed 3.31.0+dfsg-0ubuntu0.24.04.1
released
resolute
Fixed 3.31.0+dfsg-0ubuntu0.26.04.1
released
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
freerdp
Amazon Linux 2023
2:3.31.0-1.amzn2023
fixed
freerdp-debuginfo
Amazon Linux 2023
2:3.31.0-1.amzn2023
fixed
freerdp-debugsource
Amazon Linux 2023
2:3.31.0-1.amzn2023
fixed
freerdp-devel
Amazon Linux 2023
2:3.31.0-1.amzn2023
fixed
freerdp-libs
Amazon Linux 2023
2:3.31.0-1.amzn2023
fixed
freerdp-libs-debuginfo
Amazon Linux 2023
2:3.31.0-1.amzn2023
fixed
freerdp-server
Amazon Linux 2023
2:3.31.0-1.amzn2023
fixed
freerdp-server-debuginfo
Amazon Linux 2023
2:3.31.0-1.amzn2023
fixed
libwinpr
Amazon Linux 2023
2:3.31.0-1.amzn2023
fixed
libwinpr-debuginfo
Amazon Linux 2023
2:3.31.0-1.amzn2023
fixed
libwinpr-devel
Amazon Linux 2023
2:3.31.0-1.amzn2023
fixed
Common Weakness Enumeration
References
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-x7v6-xfx3-52j6
https://www.vulncheck.com/advisories/freerdp-3.0.0-through-3.30.0-protocol-negotiation-bypass