---
id: CVE-2026-91969
title: >-
  vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in
  the POST /api/v2/migration/csv/migrate endpoint that fails to limit parsed row
  cardinality
summary: >-
  vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in
  the POST /api/v2/migration/csv/migrate endpoint that fails to limit parsed row
  cardinality. Authenticated attackers can upload multipart CSV files with
  millions…
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-400
vendor: go-vikunja
product: vikunja
affected:
  - vikunja >= 2.5.0 < 2.6.0
published: '2026-09-15'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T20:18:54.533'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91969'
references:
  - url: >-
      https://github.com/go-vikunja/vikunja/security/advisories/GHSA-pqf9-h8g4-8gmh
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/vikunja-before-2.6.0-resource-exhaustion-via-csv-migration
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-17T19:16:21.978485Z'
epss: 0.00436
epssPercentile: 0.35132
ingestedAt: '2026-09-15T15:39:12.914Z'
---

## Overview

vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in the POST /api/v2/migration/csv/migrate endpoint that fails to limit parsed row cardinality. Authenticated attackers can upload multipart CSV files with millions of tiny records to exhaust process memory and terminate the API service.

## Remediation

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