{
  "cveId": "CVE-2026-55200",
  "url": "https://patchblox.com/security/cve/CVE-2026-55200",
  "summary": "CVE-2026-55200 is fixed in 7 products on 1 platform, first by libssh2-1t64 1.11.1-1ubuntu0.26.04.2, released June 18, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "libssh2: libssh2 1.11.1, fixed in commit 97acf3d, contains an out-of-bounds write vulnerability in ssh2_transport_read() that...",
  "description": "libssh2 1.11.1, fixed in commit 97acf3d, contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt heap memory and achieve remote code execution.",
  "published": "2026-06-17T13:17:00Z",
  "severity": "high",
  "cvss": 8.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L",
  "epss": 0.03877,
  "epssPercentile": 0.90275,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libssh2",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.11.1-1\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-55200",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-55200",
      "released": "2026-06-26T17:32:29Z"
    },
    {
      "platform": "linux",
      "product": "libssh2",
      "release": "Debian 14",
      "fixedVersion": "1.11.1-4",
      "fix": "DEBIAN-CVE-2026-55200",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-55200",
      "released": "2026-06-26T17:32:29Z"
    },
    {
      "platform": "linux",
      "product": "libssh2",
      "release": "Fedora 43",
      "fixedVersion": "1.11.1-9.fc43",
      "fix": "FEDORA-2026-EED9E67393",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-eed9e67393",
      "released": "2026-06-24T17:21:03Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-1t64",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.11.1-1ubuntu0.25.10.2",
      "fix": "libssh2-1t64 1.11.1-1ubuntu0.25.10.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libssh2-1t64-1.11.1-1ubuntu0.25.10.2",
      "released": "2026-07-03T14:54:55Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-1t64",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.11.1-1ubuntu0.26.04.2",
      "fix": "libssh2-1t64 1.11.1-1ubuntu0.26.04.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libssh2-1t64-1.11.1-1ubuntu0.26.04.2",
      "released": "2026-06-18T14:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-debuginfo",
      "release": "Fedora 43",
      "fixedVersion": "1.11.1-9.fc43",
      "fix": "FEDORA-2026-EED9E67393",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-eed9e67393",
      "released": "2026-06-24T17:21:03Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-debugsource",
      "release": "Fedora 43",
      "fixedVersion": "1.11.1-9.fc43",
      "fix": "FEDORA-2026-EED9E67393",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-eed9e67393",
      "released": "2026-06-24T17:21:03Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-devel",
      "release": "Fedora 43",
      "fixedVersion": "1.11.1-9.fc43",
      "fix": "FEDORA-2026-EED9E67393",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-eed9e67393",
      "released": "2026-06-24T17:21:03Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-docs",
      "release": "Fedora 43",
      "fixedVersion": "1.11.1-9.fc43",
      "fix": "FEDORA-2026-EED9E67393",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-eed9e67393",
      "released": "2026-06-24T17:21:03Z"
    },
    {
      "platform": "linux",
      "product": "libssh2_org",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.11.1-160000.4.1",
      "fix": "OPENSUSE-SU-2026:21057-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21057-1",
      "released": "2026-06-25T11:51:43Z"
    },
    {
      "platform": "linux",
      "product": "libssh2_org",
      "release": "sles 16.0",
      "fixedVersion": "1.11.1-160000.4.1",
      "fix": "SUSE-SU-2026:22364-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22364-1",
      "released": "2026-06-25T11:50:54Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}