CVE-2026-56297

EUVD-2026-42255
FreeRDP before 3.22.0 contains a use-after-free vulnerability in dvcman_channel_close and dvcman_call_on_receive due to improper synchronization of channel_callback access. A malicious RDP server can trigger a race condition by sending DYNVC_DATA and DYNVC_CLOSE messages concurrently, causing heap-use-after-free in the drdynvc client thread and potentially enabling remote code execution or denial of service.
Race Condition
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 29.43%
Affected Products (NVD)
VendorProductVersion
freerdpfreerdp
𝑥
< 3.22.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
freerdp2
bookworm
vulnerable
bullseye
vulnerable
bullseye (security)
vulnerable
freerdp3
forky
3.30.0+dfsg-1
fixed
sid
3.30.0+dfsg-1
fixed
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
freerdp
bionic
needs-triage
jammy
dne
noble
dne
questing
dne
resolute
dne
xenial
needs-triage
freerdp2
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
dne
resolute
dne
freerdp3
jammy
dne
noble
Fixed 3.30.0+dfsg-0ubuntu0.24.04.1
released
questing
ignored
resolute
not-affected
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
freerdp
suse enterprise desktop 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise sap 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise server 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise workstation 15 SP7
3.10.3-150700.3.17.1
fixed
freerdp-devel
suse enterprise desktop 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise sap 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise server 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise workstation 15 SP7
3.10.3-150700.3.17.1
fixed
freerdp-proxy
suse enterprise desktop 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise sap 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise server 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise workstation 15 SP7
3.10.3-150700.3.17.1
fixed
freerdp-proxy-plugins
suse enterprise desktop 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise sap 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise server 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise workstation 15 SP7
3.10.3-150700.3.17.1
fixed
freerdp-sdl
suse enterprise desktop 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise sap 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise server 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise workstation 15 SP7
3.10.3-150700.3.17.1
fixed
freerdp-server
suse enterprise desktop 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise sap 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise server 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise workstation 15 SP7
3.10.3-150700.3.17.1
fixed
libfreerdp-server-proxy3-3
suse enterprise desktop 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise sap 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise server 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise workstation 15 SP7
3.10.3-150700.3.17.1
fixed
libfreerdp3-3
suse enterprise desktop 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise sap 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise server 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise workstation 15 SP7
3.10.3-150700.3.17.1
fixed
librdtk0-0
suse enterprise desktop 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise sap 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise server 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise workstation 15 SP7
3.10.3-150700.3.17.1
fixed
libwinpr3-3
suse enterprise desktop 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise sap 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise server 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise workstation 15 SP7
3.10.3-150700.3.17.1
fixed
winpr-devel
suse enterprise desktop 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise sap 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise server 15 SP7
3.10.3-150700.3.17.1
fixed
suse enterprise workstation 15 SP7
3.10.3-150700.3.17.1
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
freerdp
Amazon Linux 2
2:2.11.7-1.amzn2.0.5
fixed
Amazon Linux 2023
2:3.6.3-1.amzn2023.0.13
fixed
freerdp-debuginfo
Amazon Linux 2
2:2.11.7-1.amzn2.0.5
fixed
Amazon Linux 2023
2:3.6.3-1.amzn2023.0.13
fixed
freerdp-debugsource
Amazon Linux 2023
2:3.6.3-1.amzn2023.0.13
fixed
freerdp-devel
Amazon Linux 2
2:2.11.7-1.amzn2.0.5
fixed
Amazon Linux 2023
2:3.6.3-1.amzn2023.0.13
fixed
freerdp-libs
Amazon Linux 2
2:2.11.7-1.amzn2.0.5
fixed
Amazon Linux 2023
2:3.6.3-1.amzn2023.0.13
fixed
freerdp-libs-debuginfo
Amazon Linux 2023
2:3.6.3-1.amzn2023.0.13
fixed
freerdp-server
Amazon Linux 2023
2:3.6.3-1.amzn2023.0.13
fixed
freerdp-server-debuginfo
Amazon Linux 2023
2:3.6.3-1.amzn2023.0.13
fixed
libwinpr
Amazon Linux 2
2:2.11.7-1.amzn2.0.5
fixed
Amazon Linux 2023
2:3.6.3-1.amzn2023.0.13
fixed
libwinpr-debuginfo
Amazon Linux 2023
2:3.6.3-1.amzn2023.0.13
fixed
libwinpr-devel
Amazon Linux 2
2:2.11.7-1.amzn2.0.5
fixed
Amazon Linux 2023
2:3.6.3-1.amzn2023.0.13
fixed
Common Weakness Enumeration
References
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h
https://www.vulncheck.com/advisories/freerdp-use-after-free-via-race-condition-in-drdynvc-channel-callback
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h