{
  "cveId": "CVE-2026-66032",
  "url": "https://patchblox.com/security/cve/CVE-2026-66032",
  "summary": "CVE-2026-66032 is fixed in 11 products on 1 platform, first by libssh2-1 1.8.0-1ubuntu0.1\u002Besm1, released July 24, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "libssh2 Double-Free Heap Corruption via sftp_open()",
  "description": "libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftp_open() function in src/sftp.c that allows a malicious SSH server to corrupt the heap of any authenticated client opening an SFTP session. When a server responds to SSH_FXP_OPEN with SSH_FXP_STATUS containing FX_OK, the response data buffer is freed, and if a subsequent sftp_packet_require() call returns a specific error such as LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED, the same pointer is freed a second time, enabling tcache dup conditions on glibc systems that allow overlapping allocations and function pointer overwrites.",
  "published": "2026-07-24T10:17:00Z",
  "severity": "Important",
  "cvss": 8.8,
  "cwe": "Double Free",
  "epss": 0.00448,
  "epssPercentile": 0.39199,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66032",
  "fixes": [
    {
      "platform": "linux",
      "product": "cargo-c",
      "release": "amzn 2023",
      "fixedVersion": "0.10.21-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-2064",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2064",
      "released": "2026-08-17T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "cargo-c-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "0.10.21-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-2064",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2064",
      "released": "2026-08-17T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libssh2",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "1.10.0-3\u002Bdeb12u1",
      "fix": "DEBIAN-CVE-2026-66032",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-66032",
      "released": "2026-08-01T14:28:19Z"
    },
    {
      "platform": "linux",
      "product": "libssh2",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.11.1-1\u002Bdeb13u2",
      "fix": "DEBIAN-CVE-2026-66032",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-66032",
      "released": "2026-08-01T14:28:19Z"
    },
    {
      "platform": "linux",
      "product": "libssh2",
      "release": "Debian 14",
      "fixedVersion": "1.11.1-5",
      "fix": "DEBIAN-CVE-2026-66032",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-66032",
      "released": "2026-08-01T14:28:19Z"
    },
    {
      "platform": "linux",
      "product": "libssh2",
      "release": "amzn 2023",
      "fixedVersion": "1.10.0-1.amzn2023.0.6",
      "fix": "ALAS2023-2026-2056",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2056",
      "released": "2026-08-17T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-1",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.8.0-1ubuntu0.1\u002Besm1",
      "fix": "libssh2-1 1.8.0-1ubuntu0.1\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libssh2-1-1.8.0-1ubuntu0.1-esm1",
      "released": "2026-07-24T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-1",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.8.0-2.1ubuntu0.1\u002Besm1",
      "fix": "libssh2-1 1.8.0-2.1ubuntu0.1\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libssh2-1-1.8.0-2.1ubuntu0.1-esm1",
      "released": "2026-07-24T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-1",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.10.0-3ubuntu0.1",
      "fix": "libssh2-1 1.10.0-3ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libssh2-1-1.10.0-3ubuntu0.1",
      "released": "2026-07-24T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-1t64",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.11.0-4.1ubuntu0.24.04.4",
      "fix": "libssh2-1t64 1.11.0-4.1ubuntu0.24.04.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libssh2-1t64-1.11.0-4.1ubuntu0.24.04.4",
      "released": "2026-07-24T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-1t64",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.11.1-1ubuntu0.26.04.4",
      "fix": "libssh2-1t64 1.11.1-1ubuntu0.26.04.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libssh2-1t64-1.11.1-1ubuntu0.26.04.4",
      "released": "2026-07-24T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.10.0-1.amzn2023.0.6",
      "fix": "ALAS2023-2026-2056",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2056",
      "released": "2026-08-17T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "1.10.0-1.amzn2023.0.6",
      "fix": "ALAS2023-2026-2056",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2056",
      "released": "2026-08-17T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-devel",
      "release": "amzn 2023",
      "fixedVersion": "1.10.0-1.amzn2023.0.6",
      "fix": "ALAS2023-2026-2056",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2056",
      "released": "2026-08-17T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libssh2-docs",
      "release": "amzn 2023",
      "fixedVersion": "1.10.0-1.amzn2023.0.6",
      "fix": "ALAS2023-2026-2056",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2056",
      "released": "2026-08-17T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libssh2_org",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.11.1-160000.5.1",
      "fix": "OPENSUSE-SU-2026:21549-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21549-1",
      "released": "2026-08-10T15:24:32Z"
    },
    {
      "platform": "linux",
      "product": "libssh2_org",
      "release": "sles 15.6",
      "fixedVersion": "1.11.0-150600.20.6.1",
      "fix": "SUSE-SU-2026:3541-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3541-1",
      "released": "2026-08-10T12:50:14Z"
    },
    {
      "platform": "linux",
      "product": "libssh2_org",
      "release": "sles 15.7",
      "fixedVersion": "1.11.0-150600.20.6.1",
      "fix": "SUSE-SU-2026:3541-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3541-1",
      "released": "2026-08-10T12:50:14Z"
    },
    {
      "platform": "linux",
      "product": "libssh2_org",
      "release": "sles 16.0",
      "fixedVersion": "1.11.1-160000.5.1",
      "fix": "SUSE-SU-2026:23225-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23225-1",
      "released": "2026-08-10T15:24:14Z"
    },
    {
      "platform": "linux",
      "product": "rust-cargo-c-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "0.10.21-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-2064",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2064",
      "released": "2026-08-17T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}