CVE-2026-33474: Vikunja Affected by DoS via Image Preview Generation

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-03-24 · updated 2026-06-17
Weakness: CWE-400

Description

Vikunja is an open-source self-hosted task management platform. Starting in version 1.0.0-rc0 and prior to version 2.2.0, unbounded image decoding and resizing during preview generation lets an attacker exhaust CPU and memory with highly compressed but extremely large-dimension images. Version 2.2.0 patches the issue.

Affected products

go-vikunja vikunja: from 1.0.0 before 2.2.0 — fixed in 2.2.0

How to fix

Upgrade to a fixed version: go-vikunja vikunja 2.2.0. Check the vendor advisory for mitigations.

References

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-wc83-79hj-hpmq
https://vikunja.io/changelog/vikunja-v2.2.0-was-released

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