{
  "cveId": "CVE-2026-28753",
  "url": "https://patchblox.com/security/cve/CVE-2026-28753",
  "summary": "CVE-2026-28753 is fixed in 44 products on 1 platform, first by libnginx-mod-http-auth-pam 1.18.0-6ubuntu14.10, released March 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "NGINX ngx_mail_proxy_module vulnerability",
  "description": "NGINX Plus and NGINX Open Source have a vulnerability in the ngx_mail_smtp_module module due to the improper handling of CRLF sequences in DNS responses. This allows an attacker-controlled DNS server to inject arbitrary headers into SMTP upstream requests, leading to potential request manipulation. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
  "published": "2026-03-24T08:16:00Z",
  "severity": "Moderate",
  "cvss": 3.7,
  "cwe": "Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027)",
  "epss": 0.00275,
  "epssPercentile": 0.19995,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-28753",
  "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": "1.18.0-6ubuntu14.10",
      "fix": "libnginx-mod-http-auth-pam 1.18.0-6ubuntu14.10",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-auth-pam-1.18.0-6ubuntu14.10",
      "released": "2026-03-24T08:16:00Z"
    },
    {
      "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": "1.18.0-6ubuntu14.10",
      "fix": "libnginx-mod-http-cache-purge 1.18.0-6ubuntu14.10",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-cache-purge-1.18.0-6ubuntu14.10",
      "released": "2026-03-24T08:16:00Z"
    },
    {
      "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": "1.18.0-6ubuntu14.10",
      "fix": "libnginx-mod-http-dav-ext 1.18.0-6ubuntu14.10",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-dav-ext-1.18.0-6ubuntu14.10",
      "released": "2026-03-24T08:16:00Z"
    },
    {
      "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": "1.18.0-6ubuntu14.10",
      "fix": "libnginx-mod-http-echo 1.18.0-6ubuntu14.10",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-echo-1.18.0-6ubuntu14.10",
      "released": "2026-03-24T08:16:00Z"
    },
    {
      "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": "1.18.0-6ubuntu14.10",
      "fix": "libnginx-mod-http-fancyindex 1.18.0-6ubuntu14.10",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-fancyindex-1.18.0-6ubuntu14.10",
      "released": "2026-03-24T08:16:00Z"
    },
    {
      "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": "1.18.0-6ubuntu14.10",
      "fix": "libnginx-mod-http-geoip 1.18.0-6ubuntu14.10",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-geoip-1.18.0-6ubuntu14.10",
      "released": "2026-03-24T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-geoip",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.24.0-2ubuntu7.7",
      "fix": "libnginx-mod-http-geoip 1.24.0-2ubuntu7.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libnginx-mod-http-geoip-1.24.0-2ubuntu7.7",
      "released": "2026-03-24T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-geoip",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.28.0-6ubuntu1.2",
      "fix": "libnginx-mod-http-geoip 1.28.0-6ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libnginx-mod-http-geoip-1.28.0-6ubuntu1.2",
      "released": "2026-03-24T08:16:00Z"
    },
    {
      "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)",
      "fixedVersion": "1.18.0-6ubuntu14.10",
      "fix": "libnginx-mod-http-geoip2 1.18.0-6ubuntu14.10",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libnginx-mod-http-geoip2-1.18.0-6ubuntu14.10",
      "released": "2026-03-24T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-headers-more-filter",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.11\u002Besm2",
      "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"
    },
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      "platform": "linux",
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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-1.18.0-6ubuntu14.10",
      "released": "2026-03-24T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-image-filter",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
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      "fix": "libnginx-mod-http-image-filter 1.14.0-0ubuntu1.11\u002Besm2",
      "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",
      "release": "Ubuntu 20.04 LTS (focal)",
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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",
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    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-image-filter",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libnginx-mod-http-image-filter-1.24.0-2ubuntu7.7",
      "released": "2026-03-24T08:16:00Z"
    },
    {
      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libnginx-mod-http-image-filter-1.28.0-6ubuntu1.2",
      "released": "2026-03-24T08:16:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-lua",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.11\u002Besm2",
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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"
    },
    {
      "platform": "linux",
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    {
      "platform": "linux",
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      "platform": "linux",
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      "platform": "linux",
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    {
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    {
      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libnginx-mod-http-perl-1.24.0-2ubuntu7.7",
      "released": "2026-03-24T08:16:00Z"
    },
    {
      "platform": "linux",
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      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "1.28.0-6ubuntu1.2",
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    },
    {
      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-subs-filter-1.14.0-0ubuntu1.11-esm2",
      "released": "2026-05-22T08:16:00Z"
    },
    {
      "platform": "linux",
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      "release": "Ubuntu 20.04 LTS (focal)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-subs-filter-1.18.0-0ubuntu1.7-esm1",
      "released": "2026-05-22T08:16:00Z"
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}