CVE-2026-91971
Vikunja before 2.6.0 Denial of Service via Avatar Upload
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 |
| Vendor | go-vikunja |
| Product | vikunja |
| Published | Sep 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
go-vikunja / vikunja
0 < 2.6.0
References
Credits
🔍 Str1ckl4nd 🔍 7thParkk 🔍 JellowBeanz26