---
id: CVE-2026-91970
title: >-
  Vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in
  the Planka migrator that fails to enforce aggregate memory budgets during
  migration jobs
summary: >-
  Vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in
  the Planka migrator that fails to enforce aggregate memory budgets during
  migration jobs. Authenticated attackers can submit migration requests pointing
  to atta…
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: go-vikunja
product: vikunja
affected:
  - vikunja < 2.6.0
published: '2026-09-15'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:49:18.987'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91970'
references:
  - url: >-
      https://github.com/go-vikunja/vikunja/security/advisories/GHSA-wq92-8x3r-fm38
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/vikunja-before-2.6.0-resource-exhaustion-via-planka-migration
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/go-vikunja/vikunja/security/advisories/GHSA-wq92-8x3r-fm38
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-15T16:02:37.599981Z'
ingestedAt: '2026-09-15T15:39:12.913Z'
epss: 0.00436
epssPercentile: 0.35133
---

## Overview

Vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in the Planka migrator that fails to enforce aggregate memory budgets during migration jobs. Authenticated attackers can submit migration requests pointing to attacker-controlled servers advertising numerous size-compliant attachments, exhausting worker memory and causing denial of service for all users.

## Remediation

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