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.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-wq92-8x3r-fm38 Vikunja: Planka migration retains an unbounded aggregate of attacker-served attachments and can OOM the API
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 16 Sep 2026 12:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 15 Sep 2026 18:45:00 +0000

Type Values Removed Values Added
First Time appeared Go-vikunja
Go-vikunja vikunja
Vendors & Products Go-vikunja
Go-vikunja vikunja

Tue, 15 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Vikunja before 2.6.0 Resource Exhaustion via Planka Migration
First Time appeared Vikunja
Vikunja vikunja
Weaknesses CWE-770
CPEs cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*
Vendors & Products Vikunja
Vikunja vikunja
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-15T16:02:52.721Z

Reserved: 2026-09-15T11:09:54.873Z

Link: CVE-2026-91970

cve-icon Vulnrichment

Updated: 2026-09-15T16:02:49.410Z

cve-icon NVD

Status : Deferred

Published: 2026-09-15T16:17:53.803

Modified: 2026-09-16T19:49:18.987

Link: CVE-2026-91970

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-20T16:30:18Z

Weaknesses