CVE-2026-91968: Go-Vikunja Vikunja

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in the task-filter endpoint that accepts deeply nested filter expressions without recursion depth limits. Authenticated attackers can supply thousands of nested parentheses in the filter query parameter to exhaust memory and terminate the API process.

Affected products

• Go-Vikunja Vikunja: from 2.5.0, before 2.6.0 (fixed in 2.6.0)

Published 2026-09-15. Last modified 2026-09-16.