CVE-2026-1388
Inefficient Regular Expression Complexity in GitLab
Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that could have allowed an unauthenticated user to cause regular expression denial of service by sending specially crafted input to a merge request endpoint under certain conditions.
INFO
Published Date :
Feb. 25, 2026, 9:16 p.m.
Last Modified :
Feb. 28, 2026, 12:45 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | ceab7361-8a18-47b1-92ba-4d7d25f6715a | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update GitLab CE/EE to a version later than 18.7.5.
- Update GitLab CE/EE to a version later than 18.8.5.
- Update GitLab CE/EE to a version later than 18.9.1.
Public PoC/Exploit Available at Github
CVE-2026-1388 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-1388.
| URL | Resource |
|---|---|
| https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/ | Release Notes Vendor Advisory |
| https://gitlab.com/gitlab-org/gitlab/-/issues/587560 | Broken Link |
| https://hackerone.com/reports/3482893 | Permissions Required |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-1388 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-1388
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-1388 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-1388 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 28, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:* versions from (including) 18.8.0 up to (excluding) 18.8.5 *cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:* versions from (including) 18.8.0 up to (excluding) 18.8.5 *cpe:2.3:a:gitlab:gitlab:18.9.0:*:*:*:community:*:*:* *cpe:2.3:a:gitlab:gitlab:18.9.0:*:*:*:enterprise:*:*:* *cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:* versions from (including) 9.2.0 up to (excluding) 18.7.5 *cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:* versions from (including) 9.2.0 up to (excluding) 18.7.5 Added Reference Type GitLab Inc.: https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/ Types: Release Notes, Vendor Advisory Added Reference Type GitLab Inc.: https://gitlab.com/gitlab-org/gitlab/-/issues/587560 Types: Broken Link Added Reference Type GitLab Inc.: https://hackerone.com/reports/3482893 Types: Permissions Required -
New CVE Received by [email protected]
Feb. 25, 2026
Action Type Old Value New Value Added Description GitLab has remediated an issue in GitLab CE/EE affecting all versions from 9.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that could have allowed an unauthenticated user to cause regular expression denial of service by sending specially crafted input to a merge request endpoint under certain conditions. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-1333 Added Reference https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/ Added Reference https://gitlab.com/gitlab-org/gitlab/-/issues/587560 Added Reference https://hackerone.com/reports/3482893