{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.82"
              },
              {
                "fixed": "1.84"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "de42702b6cda2631e8e3ff94f8458198860b328e"
            },
            {
              "fixed": "d716d7716a452bad283323aefd88ff21eba8deef"
            },
            {
              "fixed": "656bae0dbd9b1521f840521ff786e78749fe3057"
            }
          ],
          "repo": "https://github.com/bcgit/bc-java",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "bcorg",
    "cwe_ids": [
      "CWE-327"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5588.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "1.67"
          },
          {
            "fixed": "1.80.2"
          },
          {
            "introduced": "1.81"
          },
          {
            "fixed": "1.81.1"
          },
          {
            "introduced": "2.0.6"
          },
          {
            "fixed": "2.0.11"
          },
          {
            "introduced": "2.1.7"
          },
          {
            "fixed": "2.1.11"
          },
          {
            "introduced": "2.73.7"
          },
          {
            "fixed": "2.73.11"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules), Legion of the Bouncy Castle Inc. BCPKIX-FIPS bcpkix on All (pkix modules), Legion of the Bouncy Castle Inc. BCPIX-LTS bcpkix on All (pkix modules).\n\n This vulnerability is associated with program files JcaContentVerifierProviderBuilder.Java, JcaContentVerfierProviderBuilder.Java.\n\n\n\nThis issue affects BC-JAVA: from 1.67 before 1.80.2, from 1.81 before 1.81.1, from 1.82 before 1.84; BCPKIX-FIPS: from 2.0.6 before 2.0.11, from 2.1.7 before 2.1.11; BCPIX-LTS: from 2.73.7 before 2.73.11.",
  "id": "CVE-2026-5588",
  "modified": "2026-07-18T03:41:49.512710642Z",
  "published": "2026-04-15T09:06:15.617Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://repo1.maven.org/maven2/org/bouncycastle/bcpkix-fips/"
    },
    {
      "type": "WEB",
      "url": "https://repo1.maven.org/maven2/org/bouncycastle/bcpkix-lts8on/"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5588.json"
    },
    {
      "type": "WEB",
      "url": "https://www.bouncycastle.org/download/bouncy-castle-java-fips/"
    },
    {
      "type": "WEB",
      "url": "https://www.bouncycastle.org/download/bouncy-castle-java-lts/"
    },
    {
      "type": "WEB",
      "url": "https://www.bouncycastle.org/download/bouncy-castle-java/"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:11720"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:11721"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:13631"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:14272"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:14276"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:17668"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:18054"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:18055"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:18059"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:21772"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-5588"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5588.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5588"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458634"
    },
    {
      "type": "FIX",
      "url": "https://github.com/bcgit/bc-java/commit/656bae0dbd9b1521f840521ff786e78749fe3057"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/bcgit/bc-java"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber",
      "type": "CVSS_V4"
    }
  ],
  "summary": "PKIX draft CompositeVerifier accepts empty signature sequence as valid."
}