CVE-2026-89078Network attack vectorHinoki check available

Authenticated code execution via CI regex double free

Published Sep 23, 2026 · Updated Sep 23, 2026

Double-free memory corruption in affected GitLab CE/EE 19.2–19.4 releases allows remote authenticated users to execute server code. The regular-expression parser releases the same memory twice while parsing a specially crafted expression supplied in CI/CD configuration. A valid account and permission to submit that configuration are required; successful exploitation runs arbitrary code in the GitLab server context.

CVSS severity9.9
Critical
EPSS probability0.44%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Double-free memory corruption in affected GitLab CE/EE 19.2–19.4 releases allows remote authenticated users to execute server code. The regular-expression parser releases the same memory twice while parsing a specially crafted expression supplied in CI/CD configuration. A valid account and permission to submit that configuration are required; successful exploitation runs arbitrary code in the GitLab server context.

The record

CVE
CVE-2026-89078
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
GitLab
Product
GitLab
Classifications
T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 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=19.2 <19.2.7
  2. Affected versionversion=19.3 <19.3.3
  3. Affected versionversion=19.4 <19.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=19.2 <19.2.7; version=19.3 <19.3.3; version=19.4 <19.4.1

Published CVSS scores

9.9GitLabCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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