CVE-2026-3855: GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.2.7 before 19.1.8, 19.2 before 1

Routine

LOW 3.1UPGRADE

CVE-2026-3855 is a low-severity flaw (CVSS 3.1) 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 CE/EE affecting all versions from 18.2.7 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could have allowed an authenticated user with project-level permissions to access restricted file contents on the server or cause denial of service due to improper validation of parameters in the Terraform state upload functionality.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 73%)
CISA exploited list	No
Weakness	CWE-99
Published	2026-09-16
Last modified	2026-09-28

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

Last updated 2026-09-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-16 07:16 UTCPublished CVE record published
2026-09-28 13:27 UTCUpdated Record last modified

gitlab gitlab UPGRADE

Affected: >= 18.2.7 and < 19.1.8 · >= 19.2.0 and < 19.2.6 · >= 19.3.0 and < 19.3.2

Fixed in: 19.1.8, 19.2.6, 19.3.2

Safe to downgrade to: a release before 18.2.7

1. Check installed version

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

2. UPGRADE to 19.1.8 (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 18.2.7 (Debian / Ubuntu)

apt-cache madison gitlab sudo apt install gitlab=<VERSION_BEFORE_18.2.7> 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_18.2.7> 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.

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-2026-3855?

gitlab: upgrade to 19.1.8, 19.2.6, 19.3.2. Exact commands for each OS are on this page.

Is CVE-2026-3855 being exploited?

CVE-2026-3855 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-2026-3855 affect?

CVE-2026-3855 affects gitlab. Severity is low (CVSS 3.1). GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.2.7 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could have allowed an authenticated user with project-level permission

How urgent is CVE-2026-3855?

Priority 18/100. No elevated risk signals yet.

Software pages

GitLab vulnerabilities · Terraform 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.
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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

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