CVE-2026-5588

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Source
https://cve.org/CVERecord?id=CVE-2026-5588
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-5588.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-5588
Aliases
Downstream
Related
Published
2026-04-15T09:06:15.617Z
Modified
2026-05-20T04:03:10.647574552Z
Severity
  • 6.3 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
PKIX draft CompositeVerifier accepts empty signature sequence as valid.
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).

This vulnerability is associated with program files JcaContentVerifierProviderBuilder.Java, JcaContentVerfierProviderBuilder.Java.

This 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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5588.json",
    "cwe_ids": [
        "CWE-327"
    ],
    "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"
        }
    ],
    "cna_assigner": "bcorg"
}
References

Affected packages

Git / github.com/bcgit/bc-java

Affected ranges

Type
GIT
Repo
https://github.com/bcgit/bc-java
Events
Introduced
de42702b6cda2631e8e3ff94f8458198860b328e
Fixed
d716d7716a452bad283323aefd88ff21eba8deef

Affected versions

Other
r1rv82
r1rv83

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-5588.json"