CVE-2026-103602

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Source

https://cve.org/CVERecord?id=CVE-2026-103602

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103602.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-103602

Published

2026-10-02T07:10:03Z

Modified

2026-10-04T02:46:17Z

Severity

8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

Name constraints bypass via trailing dot in rfc822Name, dNSName and URI hosts

Details

Improper certificate validation in PkixNameConstraintValidator in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who controls, or can obtain certificates from, a name-constrained intermediate CA to have certificates accepted during PKIX certification path validation for email addresses, DNS names or URI hosts that lie within excluded subtrees applying to that CA, via an rfc822Name, dNSName or uniformResourceIdentifier name whose host ends with a dot, because names and constraints were compared without first removing the RFC 1034 root-label trailing dot, so a fully qualified host name did not match an excluded subtree for the same host written without the dot.

Database specific

{
    "cna_assigner":  "bcorg",
    "cwe_ids":  [
        "CWE-295"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103602.json"
}

References

Affected packages

Git / github.com/bcgit/bc-csharp

Affected ranges

Type

GIT

Repo

https://github.com/bcgit/bc-csharp

Events

Introduced

Fixed

4007498b13582d90ee1eda5d9920c324428b98b3

Fixed

75c3c576602886180ed92a63c89419e3bd63b392

Fixed

be276e057775a6a674a62e9d9a2583b229978f73

Fixed

f196a22bbf7765cc19b0c4f4645c74ea7ad35e09

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "2.7.0"
        }
    ],
    "source":  [
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Affected versions

release-1.*

release-1.8.0

release-1.8.0-RC.1

release-1.8.0-RC.2

release-1.8.0-RC.3

release-1.8.0-beta.1

release-1.8.0-beta.2

release-1.8.0-beta.3

release-1.8.0-beta.4

release-1.8.1

release-1.8.10

release-1.8.2

release-1.8.3

release-1.8.4

release-1.8.5

release-1.8.6

release-1.8.7

release-1.8.8

release-1.9.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103602.json"