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TI-2026-40166 Aliases CVE-2026-55639

xrdp: Out-of-bounds read in GCC Conference Create Request CS_SECURITY processing (xrdp_sec_process_mcs_data_CS_SECURITY)

Priority LOW 30CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00424 36th percentileScored 2026-11-07
Fix Fixed xrdp (neutrinolabs): 0.10.6.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
neutrinolabsxrdpbefore 0.10.6.10.10.6.1Patch availableCNA
  • xrdp Vendorneutrinolabs Affected before 0.10.6.1 Fixed in 0.10.6.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:neutrinolabs:xrdp:*:*:*:*:*:*:*:*before 0.10.6.1Vulnerableneutrinolabs
  • cpe:2.3:a:neutrinolabs:xrdp:*:*:*:*:*:*:*:* Versions before 0.10.6.1 Vulnerable ·neutrinolabs

Remediation

  • Fix · CNA xrdp (neutrinolabs) Fixed in 0.10.6.1

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55639

References

Advisory 1

Other 1

  • TI-2025-42163 xrdp improperly checks bounds of domain string length, which leads to Stack-based Buffer Overflow CVSS 3.1CRITICAL 9.8
  • TI-2026-29860 xrdp: lib_palette_update Heap Buffer Overflow & RCE CVSS 3.1CRITICAL 9.8
  • TI-2022-07540 Buffer Overflow in xrdp CVSS 3.1CRITICAL 9.8
  • TI-2022-07539 Buffer Overflow occurs in xrdp CVSS 3.1CRITICAL 9.8
  • TI-2022-07538 Out of Bound Write in xrdp CVSS 3.1CRITICAL 9.8
  • TI-2022-07537 Buffer Overflow in xrdp CVSS 3.1CRITICAL 9.8
See all 36 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences