CVE-2026-59638

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Source
https://cve.org/CVERecord?id=CVE-2026-59638
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59638.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-59638
Downstream
Published
2026-08-03T00:57:31.904Z
Modified
2026-08-03T11:45:22.190916356Z
Severity
  • 9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber CVSS Calculator
Summary
JSSE hostname verifier CN-fallback enabled by default despite documented opt-in
Details

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).

Database specific 
{
    "cna_assigner": "bcorg",
    "cwe_ids": [
        "CWE-297"
    ],
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "1.0.7"
                },
                {
                    "fixed": "1.0.24"
                },
                {
                    "introduced": "2.0.0"
                },
                {
                    "fixed": "2.0.24"
                },
                {
                    "introduced": "2.1.0"
                },
                {
                    "fixed": "2.1.24"
                }
            ]
        }
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59638.json"
}
References

Affected packages

Git / github.com/bcgit/bc-java

Affected ranges

Type
GIT
Repo
https://github.com/bcgit/bc-java
Events
Introduced
0f1260dc7e3c42be130c45fdad5b4363170ddf32
Fixed
57fbd3c501f7a369f64eda311d6a709fc0bcae84
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "1.61"
        },
        {
            "fixed": "1.85"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59638.json"

Git / github.com/bcgit/bc-lts-java

Affected ranges

Type
GIT
Repo
https://github.com/bcgit/bc-lts-java
Events
Introduced
468b5082f3f0971e80bf9edb7029c17b39b9ba0c
Fixed
f101b232c5d3e07ecdd504210a57e43831d6cd65
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "2.73.0"
        },
        {
            "fixed": "2.73.12"
        }
    ]
}

Affected versions

Other
r2rv73dot0
r2rv73dot1
r2rv73dot10
r2rv73dot11
r2rv73dot3
r2rv73dot4
r2rv73dot6
r2rv73dot8
r2rv73dot9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59638.json"