CVE-2026-91971Vikunja before 2.6.0 Denial of Service via Avatar Upload
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
go-vikunja vikunja go_vikunja:vikunja (from the name) | before 2.6.0; 2.6.0 not affected | CNA record |
References
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-4vh2-39rq-rq8jvendor-advisory
- https://www.vulncheck.com/advisories/vikunja-before-2.6.0-denial-of-service-via-avatar-uploadthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.