CVE-2026-33689

NameCVE-2026-33689
Descriptionxrdp is an open source RDP server. Versions through 0.10.5 have an out-of-bounds read vulnerability in the pre-authentication RDP message parsing logic. A remote, unauthenticated attacker can trigger this flaw by sending a specially crafted sequence of packets during the initial connection phase. This vulnerability results from insufficient validation of input buffer lengths before processing dynamic channel communication. Successful exploitation can lead to a denial-of-service (DoS) condition via a process crash or potential disclosure of sensitive information from the service's memory space. This issue has been fixed in version 0.10.6.
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
bookworm0.9.21.1-1+deb12u1vulnerable
bookworm (security)0.9.21.1-1+deb12u2vulnerable
trixie (security), trixie0.10.1-3.1+deb13u1vulnerable
forky, sid0.10.5-5vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
xrdpsource(unstable)(unfixed)

Notes

https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-92mr-6wpp-27jj

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