CVE-2026-1659

Name: CVE-2026-1659
Creator: NVD / NIST
Published: 2026-05-14T06:16:21.667+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2026-1659 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.0 before 18.9.7, 18.10 before 18.10.6, and 18.11 before 18.11.3 that could have allowed an unauthenticated user to cause denial of service by sending specially crafted requests due to insufficient input validation.. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.0 before 18.9.7, 18.10 before 18.10.6, and 18.11 before 18.11.3 that could have allowed an unauthenticated user to cause denial of service by sending specially crafted requests due to insufficient input validation.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.36%

27.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Gitlab	Gitlab	>= 9.0.0, < 18.9.7
Gitlab	Gitlab	>= 18.10.0, < 18.10.6
Gitlab	Gitlab	>= 18.11.0, < 18.11.3

References

https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released/Release Notes
https://gitlab.com/gitlab-org/gitlab/-/work_items/588201Broken Link
https://hackerone.com/reports/3519824Permissions Required

Timeline

Published: May 14, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-1659?

How severe is CVE-2026-1659?

CVE-2026-1659 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2026-1659?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-1659?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST