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CVE-2026-5588 PKIX draft CompositeVerifier accepts empty signature sequence as valid.

🗓️ 15 Apr 2026 09:06:15Reported by bcorgType 
cvelist
 cvelist🔗 www.cve.org👁 27 Views

PKIX CompositeVerifier accepts empty signature sequence in Bouncy Castle Java pkix from version 1.49 to before 1.84.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: Due to use of bcpkix-jdk18on-1.81.jar, IBM Sterling Connect:Direct Web Services is affected by Use of a Broken or Risky Cryptographic Algorithm vulnerability.
4 Jun 202602:55
–ibm
IBM Security Bulletins		Security Bulletin: Multiple vulnerabilities in IBM Rational Developer for i (CVE-2026-3505, CVE-2025-14813, CVE-2026-0636, CVE-2026-5598, CVE-2026-33671, CVE-2026-33672, CVE-2026-5588, CVE-2026-40175)
8 Jun 202613:55
–ibm
IBM Security Bulletins		Security Bulletin: There is a vulnerability in bcpkix-jdk18on-1.81.jar used by IBM Maximo Manage application in IBM Maximo Application Suite (CVE-2026-5588)
29 May 202609:58
–ibm
IBM Security Bulletins		Security Bulletin: Maximo AI Service uses multiple third party dependencies which are vulnerable to multiple CVEs.
1 Jun 202608:35
–ibm
IBM Security Bulletins		Security Bulletin: MongoDB Enterprised Advanced affected by: Use of a Broken or Risky Cryptographic Algorithm (CVE-2026-5588)
15 Jun 202622:18
–ibm
IBM Security Bulletins		Security Bulletin: IBM Sterling Connect:Direct for Microsoft Windows is vulnerable to an issue in Bouncy Castle
27 May 202615:07
–ibm
ATTACKERKB		CVE-2026-5588
15 Apr 202609:06
–attackerkb
Tenable Nessus		Amazon Linux 2023 : bouncycastle, bouncycastle-javadoc, bouncycastle-mail (ALAS2023-2026-1775)
8 Jun 202600:00
–nessus
Tenable Nessus		RHEL 8 : Red Hat JBoss Enterprise Application Platform 8.1.6 (RHSA-2026:18054)
18 May 202600:00
–nessus
Tenable Nessus		RHEL 9 : Red Hat JBoss Enterprise Application Platform 8.1.6 (RHSA-2026:18055)
18 May 202600:00
–nessus
Rows per page
[
  {
    "vendor": "Legion of the Bouncy Castle Inc.",
    "product": "BC-JAVA",
    "platforms": [
      "all"
    ],
    "collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java/",
    "packageName": "bcpkix",
    "repo": "https://github.com/bcgit/bc-java",
    "modules": [
      "pkix"
    ],
    "programFiles": [
      "JcaContentVerifierProviderBuilder.java"
    ],
    "versions": [
      {
        "status": "affected",
        "version": "1.67",
        "lessThan": "1.80.2",
        "versionType": "maven"
      },
      {
        "status": "affected",
        "version": "1.81",
        "lessThan": "1.81.1",
        "versionType": "maven"
      },
      {
        "status": "affected",
        "version": "1.82",
        "lessThan": "1.84",
        "versionType": "maven"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "Legion of the Bouncy Castle Inc.",
    "product": "BCPKIX-FIPS",
    "platforms": [
      "All"
    ],
    "collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java-fips/",
    "packageName": "bcpkix",
    "repo": "https://repo1.maven.org/maven2/org/bouncycastle/bcpkix-fips/",
    "modules": [
      "pkix"
    ],
    "programFiles": [
      "JcaContentVerifierProviderBuilder.java"
    ],
    "versions": [
      {
        "status": "affected",
        "version": "2.0.6",
        "lessThan": "2.0.11",
        "versionType": "maven"
      },
      {
        "status": "affected",
        "version": "2.1.7",
        "lessThan": "2.1.11",
        "versionType": "maven"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "Legion of the Bouncy Castle Inc.",
    "product": "BCPIX-LTS",
    "platforms": [
      "All"
    ],
    "collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java-lts/",
    "packageName": "bcpkix",
    "repo": "https://repo1.maven.org/maven2/org/bouncycastle/bcpkix-lts8on/",
    "modules": [
      "pkix"
    ],
    "programFiles": [
      "JcaContentVerfierProviderBuilder.java"
    ],
    "versions": [
      {
        "status": "affected",
        "version": "2.73.7",
        "lessThan": "2.73.11",
        "versionType": "maven"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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18 May 2026 23:22Current
CVSS 46.3
EPSS0.00259
CWE-327
composite verifierempty signaturepkixbouncy castle javavulnerabilityaffected version 1.49before 1.84
27