{
  "cveId": "CVE-2026-59638",
  "url": "https://patchblox.com/security/cve/CVE-2026-59638",
  "summary": "CVE-2026-59638 is fixed in 7 products on 1 platform, first by DEBIAN-CVE-2026-59638, released August 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "bouncycastle: In Bouncy Castle for Java before 1.85, JSSE hostname verifier CN-fallback enabled by default despite documented opt-in",
  "description": "In Bouncy Castle for Java before 1.85, JSSE hostname verifier CN-fallback enabled by default despite documented opt-in. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bctls-fips 1.0.24 (1.0.X series), 2.0.24 (2.0.X series) and 2.1.24 (2.1.X series).",
  "published": "2026-08-03T01:16:43Z",
  "severity": "medium",
  "cvss": 6.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
  "epss": 0.00345,
  "epssPercentile": 0.28268,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bouncycastle",
      "release": "Debian 14",
      "fixedVersion": "1.86-1",
      "fix": "DEBIAN-CVE-2026-59638",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-59638",
      "released": "2026-08-03T01:16:43Z"
    },
    {
      "platform": "linux",
      "product": "bouncycastle",
      "release": "amzn 2023",
      "fixedVersion": "1.70-4.amzn2023.0.8",
      "fix": "ALAS2023-2026-2153",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2153",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bouncycastle",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.85-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21538-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21538-1",
      "released": "2026-08-06T07:36:52Z"
    },
    {
      "platform": "linux",
      "product": "bouncycastle",
      "release": "sles 15.6",
      "fixedVersion": "1.85-150200.3.38.1",
      "fix": "SUSE-SU-2026:3559-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3559-1",
      "released": "2026-08-10T18:04:57Z"
    },
    {
      "platform": "linux",
      "product": "bouncycastle",
      "release": "sles 15.7",
      "fixedVersion": "1.85-150200.3.38.1",
      "fix": "SUSE-SU-2026:3559-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3559-1",
      "released": "2026-08-10T18:04:57Z"
    },
    {
      "platform": "linux",
      "product": "bouncycastle",
      "release": "sles 16.0",
      "fixedVersion": "1.85-160000.1.1",
      "fix": "SUSE-SU-2026:23150-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23150-1",
      "released": "2026-08-06T07:40:53Z"
    },
    {
      "platform": "linux",
      "product": "bouncycastle-javadoc",
      "release": "amzn 2023",
      "fixedVersion": "1.70-4.amzn2023.0.8",
      "fix": "ALAS2023-2026-2153",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2153",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bouncycastle-mail",
      "release": "amzn 2023",
      "fixedVersion": "1.70-4.amzn2023.0.8",
      "fix": "ALAS2023-2026-2153",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2153",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bouncycastle-pg",
      "release": "amzn 2023",
      "fixedVersion": "1.70-4.amzn2023.0.8",
      "fix": "ALAS2023-2026-2153",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2153",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bouncycastle-pkix",
      "release": "amzn 2023",
      "fixedVersion": "1.70-4.amzn2023.0.8",
      "fix": "ALAS2023-2026-2153",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2153",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bouncycastle-tls",
      "release": "amzn 2023",
      "fixedVersion": "1.70-4.amzn2023.0.8",
      "fix": "ALAS2023-2026-2153",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2153",
      "released": "2026-09-14T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "bouncycastle-util",
      "release": "amzn 2023",
      "fixedVersion": "1.70-4.amzn2023.0.8",
      "fix": "ALAS2023-2026-2153",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-2153",
      "released": "2026-09-14T09:00:00Z"
    }
  ],
  "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"
  }
}