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

What is CVE-2026-33474?

CVE-2026-33474 is a medium-severity denial of service vulnerability in go-vikunja vikunja, published on 24 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-400

Which versions are affected by CVE-2026-33474?

3 open source packages ship an affected version, including code.vikunja.io/api. It affects 1 product.

Products include Vikunja Vikunja.

How do I fix CVE-2026-33474?

Upgrade code.vikunja.io/api to 2.2.0 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-33474 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33474 exists.

Other vulnerabilities in go-vikunja vikunja

• CVE-2026-28268 Vikunja Vulnerable to Account Takeover via Password Reset Token Reuse Critical 9.8
• CVE-2026-27575 Vijkunja has Weak Password Policy Combined with Persistent Sessions After Password Change Critical 9.1
• CVE-2026-25935 Vikunja Affected by XSS Via Task Preview High 8.6
• CVE-2026-35595 Vikunja Affected by Privilege Escalation via Project Reparenting High 8.3
• CVE-2026-33316 Vikunja’s Improper Access Control Enables Bypass of Administrator-Imposed Account Disablement High 8.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-wc83-79hj-hpmq, GO-2026-4811.