CVE-2026-91971: Go-Vikunja Vikunja

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

Vikunja before 2.6.0 fails to apply pixel decode limits to avatar and project-background upload endpoints, allowing authenticated users to upload crafted images that decode to excessive pixel counts. Attackers can upload small images with extreme aspect ratios that consume significant CPU and memory during processing, causing denial of service through repeated or concurrent uploads.

Affected products

• Go-Vikunja Vikunja: before 2.6.0 (fixed in 2.6.0)

Published 2026-09-15. Last modified 2026-09-21.