Duplicate Advisory: Vikunja: Unbounded image decode on avatar and project-background uploads enables decode/resize amplification

{
  "id": "35dd4e0c103dce277afd19943718dff3ec5b67b8be0cf6b30d69b68c3c497707",
  "url": "https://osv.dev/vulnerability/GHSA-69rj-q3v9-vffp",
  "method": "structured",
  "payload": {
    "kind": "withdrawal",
    "title": "Duplicate Advisory: Vikunja: Unbounded image decode on avatar and project-background uploads enables decode/resize amplification",
    "summary": "### Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-4vh2-39rq-rq8j.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.",
    "evidence": "osv:GHSA-69rj-q3v9-vffp",
    "products": [
      {
        "name": {
          "value": "code.vikunja.io/api",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-69rj-q3v9-vffp",
      "aliases": [
        "GHSA-69rj-q3v9-vffp"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        },
        {
          "type": "CVSS_V4",
          "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "2.5.0"
                }
              ]
            }
          ],
          "package": {
            "name": "code.vikunja.io/api",
            "purl": "pkg:golang/code.vikunja.io/api",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-69rj-q3v9-vffp/GHSA-69rj-q3v9-vffp.json"
          }
        }
      ],
      "modified": "2026-10-09T21:00:05.626981449Z",
      "provider": "osv",
      "references": [
        "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-4vh2-39rq-rq8j",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-91971",
        "https://www.vulncheck.com/advisories/vikunja-before-2.6.0-denial-of-service-via-avatar-upload"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": "2026-09-15T16:17:53Z",
        "github_reviewed_at": "2026-10-09T20:52:09Z"
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 124140,
  "published_at": "2026-09-15T18:32:30+00:00"
}