CVE-2026-18252Network attack vectorHinoki check available

Authenticated CI command execution via untrusted agent configuration

Published Aug 26, 2026 · Updated Aug 27, 2026

Command injection in affected GitLab EE 18.9, 19.2, and 19.3 releases allows remote authenticated users to run commands in a CI context. The Duo Claude AI agent processes configuration from a user-controlled source as trusted instructions; GitLab has not disclosed the specific parser or code path. Developer-role access and user interaction are required, and command execution can read or alter data available to that CI context.

CVSS severity7.3
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Command injection in affected GitLab EE 18.9, 19.2, and 19.3 releases allows remote authenticated users to run commands in a CI context. The Duo Claude AI agent processes configuration from a user-controlled source as trusted instructions; GitLab has not disclosed the specific parser or code path. Developer-role access and user interaction are required, and command execution can read or alter data available to that CI context.

The record

CVE
CVE-2026-18252
Published
Aug 26, 2026
Updated
Aug 27, 2026
Vendor
GitLab
Product
GitLab
Classifications
CWE-829, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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=18.9 <19.1.7
  2. Affected versionversion=19.2 <19.2.5
  3. Affected versionversion=19.3 <19.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=18.9 <19.1.7; version=19.2 <19.2.5; version=19.3 <19.3.1

Published CVSS scores

7.3GitLabCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-829Inclusion of Functionality from Untrusted Control Sphere
T1059Command and Scripting Interpreter

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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