CVE-2026-18252: GitLab has remediated an issue in GitLab EE affecting all versions from 18.9 before 19.1.7, 19.2 before 19.2.5

Routine

HIGH 7.3UPGRADE

CVE-2026-18252 is a high-severity flaw (CVSS 7.3) affecting gitlab. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

GitLab has remediated an issue in GitLab EE affecting all versions from 18.9 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1 that, under certain conditions, an authenticated user with developer-role permissions could have executed arbitrary commands in a CI context, due to the Claude agent processing configuration from a user-controlled source.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-829
Published	2026-08-26
Last modified	2026-08-31

Publisher (CNA): GitLab Inc. · Vendor: gitlab

Last updated 2026-08-31 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-26 14:17 UTCPublished CVE record published
2026-08-31 15:42 UTCUpdated Record last modified

gitlab gitlab UPGRADE

Affected: >= 18.9.0 and < 19.1.7 · >= 19.2.0 and < 19.2.5 · 19.3.0

Fixed in: 19.1.7, 19.2.5

Safe to downgrade to: a release before 18.9.0

1. Check installed version

apt-cache policy gitlab || rpm -q gitlab || gitlab --version

2. UPGRADE to 19.1.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade gitlab

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gitlab

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 18.9.0 (Debian / Ubuntu)

apt-cache madison gitlab sudo apt install gitlab=<VERSION_BEFORE_18.9.0> sudo apt-mark hold gitlab

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list gitlab sudo dnf downgrade gitlab-<VERSION_BEFORE_18.9.0> sudo dnf versionlock add gitlab

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Advisories and coverage

Official advisories

GitLab Security Releases: GitLab Patch Release: 19.3.1, 19.2.5, 19.1.7 2026-08-26

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-18252?

gitlab: upgrade to 19.1.7, 19.2.5. Exact commands for each OS are on this page.

Is CVE-2026-18252 being exploited?

CVE-2026-18252 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-18252 affect?

CVE-2026-18252 affects gitlab. Severity is high (CVSS 7.3). GitLab has remediated an issue in GitLab EE affecting all versions from 18.9 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1 that, under certain conditions, an authenticated user with developer-role permissions could have executed

How urgent is CVE-2026-18252?

Priority 37/100. High severity

Software pages

GitLab vulnerabilities

Related CVEs

CVE-2026-10086 HIGH 8.7 UPGRADE GitLab has remediated an issue in GitLab EE affecting all versions from 16.4 before 18.11.6, 19.0 before 19.0.
CVE-2026-6896 HIGH 8.7 UPGRADE GitLab has remediated an issue in GitLab EE affecting all versions from 13.11 before 18.11.7, 19.0 before 19.0
CVE-2026-84284 MEDIUM 5.3 UPGRADE GitLab has remediated an issue in GitLab CE/EE affecting all versions from 17.11 before 19.2.8, 19.3 before 19
CVE-2025-10903 MEDIUM 6.5 UPGRADE GitLab has remediated an issue in GitLab EE affecting all versions from 11.10 before 19.1.7, 19.2 before 19.2.
CVE-2026-82632 LOW 3.1 UPGRADE GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.9 before 19.2.8, 19.3 before 19.

References

← Back to latest CVEs