CVE-2026-91971CWE-400denial-of-service

CVE-2026-91971

Medium · published September 15, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
36.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
7.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00436 · 36.8th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-09-15T20:17Z
References (3)
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-4vh2-39rq-rq8j · [email protected]https://www.vulncheck.com/advisories/vikunja-before-2.6.0-denial-of-service-via-avatar-upload · [email protected]https://github.com/go-vikunja/vikunja/security/advisories/GHSA-4vh2-39rq-rq8j · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 15 SEP 15:18Z
    Vikunja before 2.6.0 Denial of Service via Avatar Upload
    cvelistv5