{
  "cveId": "CVE-2026-28388",
  "url": "https://patchblox.com/security/cve/CVE-2026-28388",
  "summary": "CVE-2026-28388 is fixed in 20 products on 1 platform, first by libssl3t64 3.5.5-1ubuntu3, released April 6, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "NULL Pointer Dereference When Processing a Delta CRL",
  "description": "This update for openssl-1_0_0 fixes the following issues\n\n- CVE-2026-7383: Possible Heap Buffer Overflow in ASN.1 Multibyte String Conversion (bsc#1266340).\n- CVE-2026-9076: Out-of-Bounds Read in CMS Password-Based Decryption (bsc#1266341).\n- CVE-2026-28388: NULL Pointer Dereference When Processing a Delta CRL (bsc#1260442).\n- CVE-2026-28389: Possible NULL dereference when processing CMS KeyAgreeRecipientInfo (bsc#1260443).\n- CVE-2026-34180: Heap Buffer Over-read in ASN.1 Content Parsing (bsc#1266342).\n- CVE-2026-42766: Possible NULL Dereference in Password-Based CMS Decryption (bsc#1266349).\n- CVE-2026-45447: Heap Use-After-Free in OpenSSL PKCS7_verify() (bsc#1266357).\n- NULL pointer dereference when processing an OCSP response (bsc#1260446).",
  "published": "2026-04-06T17:00:00Z",
  "severity": "Moderate",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "NULL Pointer Dereference",
  "epss": 0.00919,
  "epssPercentile": 0.6048,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-28388",
  "fixes": [
    {
      "platform": "linux",
      "product": "libssl1.0.0",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.0.2n-1ubuntu5.13\u002Besm4",
      "fix": "libssl1.0.0 1.0.2n-1ubuntu5.13\u002Besm4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libssl1.0.0-1.0.2n-1ubuntu5.13-esm4",
      "released": "2026-04-15T18:59:20Z"
    },
    {
      "platform": "linux",
      "product": "libssl1.1",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.1.1-1ubuntu2.1~18.04.23\u002Besm8",
      "fix": "libssl1.1 1.1.1-1ubuntu2.1~18.04.23\u002Besm8",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libssl1.1-1.1.1-1ubuntu2.1-18.04.23-esm8",
      "released": "2026-04-15T18:59:20Z"
    },
    {
      "platform": "linux",
      "product": "libssl1.1",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.1.1f-1ubuntu2.24\u002Besm3",
      "fix": "libssl1.1 1.1.1f-1ubuntu2.24\u002Besm3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libssl1.1-1.1.1f-1ubuntu2.24-esm3",
      "released": "2026-04-15T18:59:24Z"
    },
    {
      "platform": "linux",
      "product": "libssl3",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "3.0.2-0ubuntu1.23",
      "fix": "libssl3 3.0.2-0ubuntu1.23",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libssl3-3.0.2-0ubuntu1.23",
      "released": "2026-04-15T18:59:27Z"
    },
    {
      "platform": "linux",
      "product": "libssl3t64",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "3.0.13-0ubuntu3.9",
      "fix": "libssl3t64 3.0.13-0ubuntu3.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libssl3t64-3.0.13-0ubuntu3.9",
      "released": "2026-04-15T18:59:29Z"
    },
    {
      "platform": "linux",
      "product": "libssl3t64",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "3.5.3-1ubuntu3.3",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libssl3t64-3.5.3-1ubuntu3.3",
      "released": "2026-04-15T18:59:31Z"
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    {
      "platform": "linux",
      "product": "libssl3t64",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
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      "released": "2026-04-06T17:00:00Z"
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    {
      "platform": "linux",
      "product": "openssl",
      "release": "Debian 12.15 (bookworm)",
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      "fix": "DEBIAN-CVE-2026-28388",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-28388",
      "released": "2026-04-07T22:16:20Z"
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    {
      "platform": "linux",
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      "release": "Debian 13.5 (trixie)",
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      "released": "2026-04-07T22:16:20Z"
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    {
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      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-28388",
      "released": "2026-04-07T22:16:20Z"
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    {
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      "released": "2026-04-15T18:59:20Z"
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-openssl-1.1.1f-1ubuntu2.24-esm3",
      "released": "2026-04-15T18:59:24Z"
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    {
      "platform": "linux",
      "product": "openssl",
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      "released": "2026-04-15T18:59:27Z"
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      "released": "2026-04-08T12:27:58Z"
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      "released": "2026-04-13T09:00:00Z"
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      "fix": "ALAS2023-2026-1586",
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      "released": "2026-04-13T09:00:00Z"
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    {
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    {
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    }
  ],
  "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"
  }
}