CVE catalog
CVE-2026-55639
xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the parsing of Client Security Data within the Client MCS Connect Initial PDU with GCC Conference Create
- Severity
- Medium · CVSS 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.42% · Oct 25, 2026
xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the parsing of Client Security Data within the Client MCS Connect Initial PDU with GCC Conference Create Request during the connection sequence. During the initial capability and security negotiation phase, the parser fails to perform sufficient length validation for the incoming data block. A remote, unauthenticated attacker could potentially exploit this flaw by sending a specially crafted RDP packet containing malformed data. Due to missing bounds checks, the xrdp process may read a small number of bytes beyond the declared data block boundary, potentially disclosing process memory contents that could be combined with other vulnerabilities. This issue has been fixed in version 0.10.6.1.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | xrdp | sid | 0.10.6.1-3 | fixed |
| Debian | xrdp | forky | 0.10.6.1-3 | fixed |
| Debian | xrdp | trixie | 0.10.1-3.1+deb13u2 | fixed |
| Debian | xrdp | trixie-security | 0.10.1-3.1+deb13u2 | fixed |
| Debian | xrdp | bookworm | 0.9.21.1-1+deb12u2 | vulnerable |
| Debian | xrdp | bookworm-security | 0.9.21.1-1+deb12u3 | fixed |
| Cpe | xrdp | Not reported | Not reported | vulnerable |
| Cpe | xrdp | Not reported | 0.10.6.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | xrdp | source | sid | 0.10.6.1-2 | not yet assigned | Not reported | Not reported |
| Debian | xrdp | source | forky | 0.10.6.1-2 | not yet assigned | Not reported | Not reported |
| Debian | xrdp | source | trixie | 0.10.1-3.1+deb13u2 | not yet assigned | Not reported | Not reported |
| Debian | xrdp | source | bookworm | 0.9.21.1-1+deb12u3 | not yet assigned | Not reported | Not reported |
| Cpe | xrdp | cpe | Not reported | 0.10.6.1 | Not reported | NVD-CVE-2026-55639 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [xrdp]Affected
Details (6)
0.9.21.1-1+deb12u2· amd64 · bookwormAffected · Fixed:
0.9.21.1-1+deb12u3nvd · xrdp · debian · bookworm; nvd · xrdp · debian · 12
0.9.21.1-1+deb12u2· arm64 · bookwormAffected · Fixed:
0.9.21.1-1+deb12u3nvd · xrdp · debian · bookworm; nvd · xrdp · debian · 12
0.9.24-5~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
0.9.21.1-1+deb12u3nvd · xrdp · debian · bookworm; nvd · xrdp · debian · 12
0.9.24-5~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
0.9.21.1-1+deb12u3nvd · xrdp · debian · bookworm; nvd · xrdp · debian · 12
0.9.21.1-1+deb12u3· amd64 · bookworm-securityFixed · Fixed:
0.9.21.1-1+deb12u3nvd · xrdp · debian · bookworm; nvd · xrdp · debian · 12
0.9.21.1-1+deb12u3· arm64 · bookworm-securityFixed · Fixed:
0.9.21.1-1+deb12u3nvd · xrdp · debian · bookworm; nvd · xrdp · debian · 12
[Debian 13 (Trixie)]
- [xrdp]Affected
Details (5)
0.10.1-3.1+deb13u1· amd64 · trixieAffected · Fixed:
0.10.1-3.1+deb13u2nvd · xrdp · debian · 13
0.10.1-3.1+deb13u1· arm64 · trixieAffected · Fixed:
0.10.1-3.1+deb13u2nvd · xrdp · debian · 13
0.10.1-3.1+deb13u1· amd64 · trixie-security · Historical versionAffected · Fixed:
0.10.1-3.1+deb13u2nvd · xrdp · debian · 13
0.10.1-3.1+deb13u2· amd64 · trixie-securityFixed · Fixed:
0.10.1-3.1+deb13u2nvd · xrdp · debian · 13
0.10.1-3.1+deb13u2· arm64 · trixie-securityFixed · Fixed:
0.10.1-3.1+deb13u2nvd · xrdp · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11543-1.json]
- [https://github.com/neutrinolabs/xrdp/releases/tag/v0.10.6.1]
- [https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-6g36-mxcf-r3gc]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-55639]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-55639]
- [https://security-tracker.debian.org/tracker/CVE-2026-55639]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55639.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]