{
  "cveId": "CVE-2025-59530",
  "url": "https://patchblox.com/security/cve/CVE-2025-59530",
  "summary": "CVE-2025-59530 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2025-59530, released October 10, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "quic-go has Client Crash Due to Premature HANDSHAKE_DONE Frame",
  "description": "quic-go is an implementation of the QUIC protocol in Go. In versions prior to 0.49.0, 0.54.1, and 0.55.0, a misbehaving or malicious server can cause a denial-of-service (DoS) attack on the quic-go client by triggering an assertion failure, leading to a process crash. This requires no authentication and can be exploited during the handshake phase. This was observed in the wild with certain server implementations. quic-go needs to be able to handle misbehaving server implementations, including those that prematurely send a HANDSHAKE_DONE frame. Versions 0.49.0, 0.54.1, and 0.55.0 discard Initial keys when receiving a HANDSHAKE_DONE frame, thereby correctly handling premature HANDSHAKE_DONE frames.",
  "published": "2025-10-10T16:15:52Z",
  "severity": "Important",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "Reachable Assertion",
  "epss": 0.00465,
  "epssPercentile": 0.40537,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59530",
  "fixes": [
    {
      "platform": "linux",
      "product": "golang-github-lucas-clemente-quic-go",
      "release": "Debian 14",
      "fixedVersion": "0.54.1-1",
      "fix": "DEBIAN-CVE-2025-59530",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-59530",
      "released": "2025-10-10T16:15:52Z"
    },
    {
      "platform": "linux",
      "product": "govulncheck-vulndb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "0.0.20260723T184607-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21483-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21483-1",
      "released": "2026-07-30T09:09:47Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}