CVE-2026-91971
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductCode.vikunja.io/api
PublishedSep 15, 2026
First seenSep 15, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- code.vikunja.io/api2.6.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| code.vikunja.io/apiGo | v < 2.6.0, No range specified | 2.6.0 |
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