CVE-2026-55238Network attack vector

Connection-process crash via malformed capability sets

Published Jul 20, 2026 · Updated Jul 20, 2026

Buffer over-read in xrdp 0.10.6 and earlier allows remote attackers to crash a connection-handling process via malformed RDP capability data. The xrdp_caps_process_confirm_active parser in libxrdp/xrdp_caps.c dispatched specific capability sets without verifying that each declared buffer contained the fields read by its handler. No authentication or user interaction is required, but the default per-connection fork model confines a typical crash to the child process rather than the entire service.

CVSS severity5.3
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer over-read in xrdp 0.10.6 and earlier allows remote attackers to crash a connection-handling process via malformed RDP capability data. The xrdp_caps_process_confirm_active parser in libxrdp/xrdp_caps.c dispatched specific capability sets without verifying that each declared buffer contained the fields read by its handler. No authentication or user interaction is required, but the default per-connection fork model confines a typical crash to the child process rather than the entire service.

The record

CVE
CVE-2026-55238
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
neutrinolabs
Product
xrdp
Classifications
CWE-126, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.10.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

neutrinolabs · xrdpversion=< 0.10.6.1

Published CVSS scores

5.3neutrinolabsCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-126Buffer Over-read
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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