CVE-2026-41252

NameCVE-2026-41252
Descriptionxrdp is an open source RDP server. Versions 0.10.6 and prior contain a missing bounds check in xrdp, which allows a heap-based buffer overflow when operating in vnc-any mode. The issue occurs during the handling of RFB protocol color map messages from a VNC server, where incoming color indices are not properly validated. A malicious VNC server can exploit this flaw by sending crafted messages with out-of-range values, leading to an out-of-bounds write on the heap. This memory corruption can result in a denial of service (DoS) or potentially allow remote code execution (RCE) prior to authentication. This issue has been fixed in version 0.10.6.1.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
xrdp (PTS)bullseye0.9.21.1-1~deb11u1vulnerable
bullseye (security)0.9.21.1-1~deb11u3vulnerable
bookworm, bookworm (security)0.9.21.1-1+deb12u2vulnerable
trixie (security), trixie0.10.1-3.1+deb13u1vulnerable
sid0.10.6.1-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
xrdpsourceexperimental0.10.6.1-1
xrdpsource(unstable)0.10.6.1-2

Notes

https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-w5vg-6qmv-j63j

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