{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:ryandfir:unfurl:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2026.04"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "ae801d5fba62777d601e39b25e06ac102fafa4ec"
            }
          ],
          "repo": "https://github.com/RyanDFIR/unfurl",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-h5qv-qjv4-pc5m"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-409",
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40036.json"
  },
  "details": "Unfurl before 2026.04 contains an unbounded zlib decompression vulnerability in parse_compressed.py that allows remote attackers to cause denial of service. Attackers can submit highly compressed payloads via URL parameters to the /json/visjs endpoint that expand to gigabytes, exhausting server memory and crashing the service.",
  "id": "CVE-2026-40036",
  "modified": "2026-07-08T05:37:41.716966408Z",
  "published": "2026-04-08T21:35:28.460Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40036.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/obsidianforensics/unfurl/security/advisories/GHSA-h5qv-qjv4-pc5m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40036"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/dfir-unfurl-denial-of-service-via-unbounded-zlib-decompression"
    },
    {
      "type": "FIX",
      "url": "https://github.com/obsidianforensics/unfurl/releases/tag/v2026.04"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/obsidianforensics/unfurl"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Unfurl \u003c 2026.04 - Denial of Service via Unbounded zlib Decompression"
}