HIGH 7.1 NVD
CVE-2026-91971
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
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.
References
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-4vh2-39rq-rq8j
- https://www.vulncheck.com/advisories/vikunja-before-2.6.0-denial-of-service-via-avatar-upl
This high severity vulnerability with a CVSS score of 7.1 was published on 2026-09-15 via NVD.
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