---
id: GHSA-69rj-q3v9-vffp
title: >-
  Duplicate Advisory: Vikunja: Unbounded image decode on avatar and
  project-background uploads enables decode/resize amplification
summary: >-
  Duplicate Advisory: Vikunja: Unbounded image decode on avatar and
  project-background uploads enables decode/resize amplification
severity: high
cvss: 6.5
cwe:
  - CWE-400
vendor: api
product: code.vikunja.io/api
ecosystem: go
affected:
  - code.vikunja.io/api <= 2.5.0
published: '2026-09-15'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T20:52:11Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-69rj-q3v9-vffp'
references:
  - url: >-
      https://github.com/go-vikunja/vikunja/security/advisories/GHSA-4vh2-39rq-rq8j
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91971'
  - url: >-
      https://www.vulncheck.com/advisories/vikunja-before-2.6.0-denial-of-service-via-avatar-upload
  - url: 'https://github.com/advisories/GHSA-69rj-q3v9-vffp'
tags:
  - ghsa
  - go
ingestedAt: '2026-10-09T21:12:42.329Z'
---

## Overview

### Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-4vh2-39rq-rq8j. This link is maintained to preserve external references.

### Original Description
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.

## Affected packages

- `code.vikunja.io/api <= 2.5.0`

## Remediation

Refer to the advisory for the patched release.