CVE-2026-91971
MEDIUM
NVD
CVSS Score
6.5
Severity
MEDIUM
Published
Sep 15, 2026
Vendor
unknown
Description
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.