TI-2026-39915 Aliases CVE-2026-55238

xrdp: Malformed Confirm Active capability sets cause out-of-bounds reads

LOW 31CWE-126Published 2026-07-20 · Updated 2026-07-20

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the processing of RDP Confirm Active PDU, where during the capability negotiation phase, the parser did not perform sufficient length validation for specific capability sets. A remote, unauthenticated attacker could potentially exploit this flaw by sending a specially crafted RDP packet containing malformed capability data. Due to missing bounds checks, the xrdp process may perform out-of-bounds memory reads, which can result in the termination of the service (Denial of Service). However, since xrdp forks a new process for each connection by default, an out-of-bounds read causing a process crash is unlikely to bring down the entire xrdp service. 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 0.00516 44th 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

Vendor	Product	Affected versions	Fixed in	Status	Source
neutrinolabs	xrdp	before 0.10.6.1	0.10.6.1	Patch available	CNA

xrdp Vendorneutrinolabs Affected before 0.10.6.1 Fixed in 0.10.6.1 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:neutrinolabs:xrdp::::::::	before 0.10.6.1	Vulnerable	neutrinolabs

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

2026-10-02 Threatist record created from CVE-2026-55238

References

Advisory 1

https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-mg8j-x9rw-9xv3

Other 1

https://github.com/neutrinolabs/xrdp/releases/tag/v0.10.6.1

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