---
id: CVE-2026-1403
title: >-
  GitLab has remediated an issue in GitLab CE/EE affecting all versions from
  11.7 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that when
  importing CSV files could have allowed an authenticated user to cause denial
  of service…
summary: >-
  GitLab has remediated an issue in GitLab CE/EE affecting all versions from
  11.7 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that when
  importing CSV files could have allowed an authenticated user to cause denial
  of service…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
vendor: GitLab
product: GitLab
affected:
  - GitLab >= 11.7 < 18.8.9
  - GitLab >= 18.9 < 18.9.5
  - GitLab >= 18.10 < 18.10.3
published: '2026-10-07'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T21:17:15.863'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-1403'
references:
  - url: 'https://gitlab.com/gitlab-org/gitlab/-/work_items/587573'
    label: cve@gitlab.com
  - url: 'https://hackerone.com/reports/3328937'
    label: cve@gitlab.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-07T20:32:30.482496Z'
ingestedAt: '2026-10-07T20:46:46.989Z'
---

## Overview

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 11.7 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that when importing CSV files could have allowed an authenticated user to cause denial of service to Sidekiq workers due to improper validation of CSV file structure.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.