{
  "schema_version": "1.5.0",
  "id": "CURL-CVE-2026-11352",
  "aliases": [
    "CVE-2026-11352"
  ],
  "summary": "QUIC zero-length UDP datagrams busy-loop",
  "modified": "2026-06-24T07:56:56.00Z",
  "database_specific": {
    "package": "curl",
    "affects": "both",
    "URL": "https://curl.se/docs/CVE-2026-11352.json",
    "www": "https://curl.se/docs/CVE-2026-11352.html",
    "issue": "https://hackerone.com/reports/3783438",
    "CWE": {
      "id": "CWE-835",
      "desc": "Loop with Unreachable Exit Condition ('Infinite Loop')"
    },
    "last_affected": "8.20.0",
    "severity": "Low"
  },
  "published": "2026-06-24T08:00:00.00Z",
  "affected": [
    {
      "ranges": [
        {
           "type": "SEMVER",
           "events": [
             {"introduced": "8.18.0"},
             {"fixed": "8.21.0"}
           ]
        },
        {
           "type": "GIT",
           "repo": "https://github.com/curl/curl.git",
           "events": [
             {"introduced": "6a3d0b6d631d5e9bec797306b5b41a9f440a088d"},
             {"fixed": "56eca2afb4806f1032872fa97d1834b3c1385276"}
           ]
        }
      ],
      "versions": [
        "8.20.0", "8.19.0", "8.18.0"
      ]
    }
  ],
  "credits": [
    {
      "name": "vectorqueue on hackerone (AntAISecurityLab)",
      "type": "FINDER"
    },
    {
      "name": "Stefan Eissing",
      "type": "REMEDIATION_DEVELOPER"
    }
  ],
  "details": "An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server\nto trigger a remote denial of service against a curl or libcurl client.\nBecause the helper function discards zero-length UDP datagrams before counting\nthem toward the per-call packet budget, a connected QUIC peer can continuously\nstream empty datagrams to indefinitely stall the client."
}