{
  "cveId": "CVE-2025-53859",
  "url": "https://patchblox.com/security/cve/CVE-2025-53859",
  "summary": "CVE-2025-53859 is fixed in 44 products on 1 platform, first by ALAS2023-2025-1152, released August 13, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "NGINX ngx_mail_smtp_module vulnerability",
  "description": "NGINX Open Source and NGINX Plus have a vulnerability in thengx_mail_smtp_module that might allow an unauthenticated attacker toover-read NGINX SMTP authentication process memory; as a result, the serverside may leak arbitrary bytes sent in a request to the authenticationserver. This issue happens during the NGINX SMTP authentication process andrequires the attacker to make preparations against the target system toextract the leaked data. The issue affects NGINX only if (1) it is builtwith the ngx_mail_smtp_module, (2) the smtp_auth directive is configuredwith method \u0022none,\u0022 and (3) the authentication server returns the\u0022Auth-Wait\u0022 response header.Note: Software versions which have reached End of Technical Support (EoTS)are not evaluated.",
  "published": "2025-08-13T06:30:00Z",
  "severity": "Medium",
  "cvss": 5.6,
  "cwe": "Out-of-bounds Read",
  "epss": 0.00439,
  "epssPercentile": 0.38379,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53859",
  "fixes": [
    {
      "platform": "linux",
      "product": "libnginx-mod-http-auth-pam",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.11\u002Besm2",
      "fix": "libnginx-mod-http-auth-pam 1.14.0-0ubuntu1.11\u002Besm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-auth-pam-1.14.0-0ubuntu1.11-esm2",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-auth-pam",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.7\u002Besm1",
      "fix": "libnginx-mod-http-auth-pam 1.18.0-0ubuntu1.7\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-auth-pam-1.18.0-0ubuntu1.7-esm1",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-auth-pam",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.18.0-6ubuntu14.7",
      "fix": "libnginx-mod-http-auth-pam 1.18.0-6ubuntu14.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-auth-pam-1.18.0-6ubuntu14.7",
      "released": "2025-08-14T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-cache-purge",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.11\u002Besm2",
      "fix": "libnginx-mod-http-cache-purge 1.14.0-0ubuntu1.11\u002Besm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-cache-purge-1.14.0-0ubuntu1.11-esm2",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-cache-purge",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.7\u002Besm1",
      "fix": "libnginx-mod-http-cache-purge 1.18.0-0ubuntu1.7\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-cache-purge-1.18.0-0ubuntu1.7-esm1",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-cache-purge",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.18.0-6ubuntu14.7",
      "fix": "libnginx-mod-http-cache-purge 1.18.0-6ubuntu14.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-cache-purge-1.18.0-6ubuntu14.7",
      "released": "2025-08-14T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-dav-ext",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.11\u002Besm2",
      "fix": "libnginx-mod-http-dav-ext 1.14.0-0ubuntu1.11\u002Besm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-dav-ext-1.14.0-0ubuntu1.11-esm2",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-dav-ext",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.7\u002Besm1",
      "fix": "libnginx-mod-http-dav-ext 1.18.0-0ubuntu1.7\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-dav-ext-1.18.0-0ubuntu1.7-esm1",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-dav-ext",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.18.0-6ubuntu14.7",
      "fix": "libnginx-mod-http-dav-ext 1.18.0-6ubuntu14.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-dav-ext-1.18.0-6ubuntu14.7",
      "released": "2025-08-14T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-echo",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.11\u002Besm2",
      "fix": "libnginx-mod-http-echo 1.14.0-0ubuntu1.11\u002Besm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-echo-1.14.0-0ubuntu1.11-esm2",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-echo",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.7\u002Besm1",
      "fix": "libnginx-mod-http-echo 1.18.0-0ubuntu1.7\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-echo-1.18.0-0ubuntu1.7-esm1",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-echo",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.18.0-6ubuntu14.7",
      "fix": "libnginx-mod-http-echo 1.18.0-6ubuntu14.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-echo-1.18.0-6ubuntu14.7",
      "released": "2025-08-14T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-fancyindex",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.11\u002Besm2",
      "fix": "libnginx-mod-http-fancyindex 1.14.0-0ubuntu1.11\u002Besm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-fancyindex-1.14.0-0ubuntu1.11-esm2",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-fancyindex",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.7\u002Besm1",
      "fix": "libnginx-mod-http-fancyindex 1.18.0-0ubuntu1.7\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-fancyindex-1.18.0-0ubuntu1.7-esm1",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-fancyindex",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.18.0-6ubuntu14.7",
      "fix": "libnginx-mod-http-fancyindex 1.18.0-6ubuntu14.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-fancyindex-1.18.0-6ubuntu14.7",
      "released": "2025-08-14T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-geoip",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.11\u002Besm2",
      "fix": "libnginx-mod-http-geoip 1.14.0-0ubuntu1.11\u002Besm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-geoip-1.14.0-0ubuntu1.11-esm2",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-geoip",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.7\u002Besm1",
      "fix": "libnginx-mod-http-geoip 1.18.0-0ubuntu1.7\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-geoip-1.18.0-0ubuntu1.7-esm1",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-geoip",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.18.0-6ubuntu14.7",
      "fix": "libnginx-mod-http-geoip 1.18.0-6ubuntu14.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-geoip-1.18.0-6ubuntu14.7",
      "released": "2025-08-14T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-geoip",
      "release": "Ubuntu 24.04.5 LTS (noble)",
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      "fix": "libnginx-mod-http-geoip 1.24.0-2ubuntu7.5",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libnginx-mod-http-geoip-1.24.0-2ubuntu7.5",
      "released": "2025-08-14T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-geoip",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "1.26.3-2ubuntu1.2",
      "fix": "libnginx-mod-http-geoip 1.26.3-2ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libnginx-mod-http-geoip-1.26.3-2ubuntu1.2",
      "released": "2025-08-15T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-geoip",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.26.3-3ubuntu3",
      "fix": "libnginx-mod-http-geoip 1.26.3-3ubuntu3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libnginx-mod-http-geoip-1.26.3-3ubuntu3",
      "released": "2025-08-14T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-geoip2",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.7\u002Besm1",
      "fix": "libnginx-mod-http-geoip2 1.18.0-0ubuntu1.7\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-geoip2-1.18.0-0ubuntu1.7-esm1",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-geoip2",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
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      "fix": "libnginx-mod-http-geoip2 1.18.0-6ubuntu14.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-geoip2-1.18.0-6ubuntu14.7",
      "released": "2025-08-14T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-headers-more-filter",
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      "fix": "libnginx-mod-http-headers-more-filter 1.14.0-0ubuntu1.11\u002Besm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-headers-more-filter-1.14.0-0ubuntu1.11-esm2",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-headers-more-filter",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-headers-more-filter-1.18.0-0ubuntu1.7-esm1",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-headers-more-filter",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-headers-more-filter-1.18.0-6ubuntu14.7",
      "released": "2025-08-14T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-image-filter",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-image-filter-1.14.0-0ubuntu1.11-esm2",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-image-filter",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-image-filter-1.18.0-0ubuntu1.7-esm1",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-image-filter",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-image-filter-1.18.0-6ubuntu14.7",
      "released": "2025-08-14T17:00:00Z"
    },
    {
      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libnginx-mod-http-image-filter-1.24.0-2ubuntu7.5",
      "released": "2025-08-14T17:00:00Z"
    },
    {
      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-libnginx-mod-http-image-filter-1.26.3-2ubuntu1.2",
      "released": "2025-08-15T00:00:00Z"
    },
    {
      "platform": "linux",
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      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-lua-1.14.0-0ubuntu1.11-esm2",
      "released": "2026-05-22T08:16:00Z"
    },
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      "released": "2026-05-22T08:16:00Z"
    },
    {
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-ndk-1.18.0-0ubuntu1.7-esm1",
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    },
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-ndk-1.18.0-6ubuntu14.7",
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      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-perl-1.14.0-0ubuntu1.11-esm2",
      "released": "2026-05-22T08:16:00Z"
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-perl-1.18.0-0ubuntu1.7-esm1",
      "released": "2026-05-22T08:16:00Z"
    },
    {
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  "attribution": {
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}