CVEDB API

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Vulnerable Software

Vulnerability Details CVE-2026-63576

Improper certificate validation in PkixNameConstraintValidator (ExtractHostFromURL) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a name-constrained subordinate CA, or anyone able to obtain certificates with chosen subjectAltName URIs from such a CA, to bypass permitted or excluded uniformResourceIdentifier name constraints during certification path validation via a URI whose path, query, fragment or userinfo contains characters such as '@' or ':', because the host was extracted by string slicing without first isolating the RFC 3986 authority component, so the host compared against the constraints could differ from the URI's actual host.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.002

EPSS Ranking 11.6%

CVSS Severity

CVSS v3 Score 7.5

References

Products affected by CVE-2026-63576

Bouncycastle » Bc-Csharp » Version: N/A

cpe:2.3:a:bouncycastle:bc-csharp:-
Bouncycastle » Bc-Csharp » Version: 1.7.0

cpe:2.3:a:bouncycastle:bc-csharp:1.7.0
Bouncycastle » Bc-Csharp » Version: 1.7.0.1

cpe:2.3:a:bouncycastle:bc-csharp:1.7.0.1
Bouncycastle » Bc-Csharp » Version: 1.7.0.2

cpe:2.3:a:bouncycastle:bc-csharp:1.7.0.2
Bouncycastle » Bc-Csharp » Version: 1.8.0

cpe:2.3:a:bouncycastle:bc-csharp:1.8.0
Bouncycastle » Bc-Csharp » Version: 1.8.1

cpe:2.3:a:bouncycastle:bc-csharp:1.8.1
Bouncycastle » Bc-Csharp » Version: 1.8.10

cpe:2.3:a:bouncycastle:bc-csharp:1.8.10
Bouncycastle » Bc-Csharp » Version: 1.8.2

cpe:2.3:a:bouncycastle:bc-csharp:1.8.2
Bouncycastle » Bc-Csharp » Version: 1.8.3

cpe:2.3:a:bouncycastle:bc-csharp:1.8.3
Bouncycastle » Bc-Csharp » Version: 1.8.4

cpe:2.3:a:bouncycastle:bc-csharp:1.8.4
Bouncycastle » Bc-Csharp » Version: 1.8.5

cpe:2.3:a:bouncycastle:bc-csharp:1.8.5
Bouncycastle » Bc-Csharp » Version: 1.8.6

cpe:2.3:a:bouncycastle:bc-csharp:1.8.6
Bouncycastle » Bc-Csharp » Version: 1.8.7

cpe:2.3:a:bouncycastle:bc-csharp:1.8.7
Bouncycastle » Bc-Csharp » Version: 1.8.8

cpe:2.3:a:bouncycastle:bc-csharp:1.8.8
Bouncycastle » Bc-Csharp » Version: 1.8.9

cpe:2.3:a:bouncycastle:bc-csharp:1.8.9
Bouncycastle » Bc-Csharp » Version: 1.9.0

cpe:2.3:a:bouncycastle:bc-csharp:1.9.0
Bouncycastle » Bc-Csharp » Version: 2.0.0

cpe:2.3:a:bouncycastle:bc-csharp:2.0.0
Bouncycastle » Bc-Csharp » Version: 2.1.0

cpe:2.3:a:bouncycastle:bc-csharp:2.1.0
Bouncycastle » Bc-Csharp » Version: 2.1.1

cpe:2.3:a:bouncycastle:bc-csharp:2.1.1
Bouncycastle » Bc-Csharp » Version: 2.2.0

cpe:2.3:a:bouncycastle:bc-csharp:2.2.0
Bouncycastle » Bc-Csharp » Version: 2.2.1

cpe:2.3:a:bouncycastle:bc-csharp:2.2.1
Bouncycastle » Bc-Csharp » Version: 2.3.0

cpe:2.3:a:bouncycastle:bc-csharp:2.3.0
Bouncycastle » Bc-Csharp » Version: 2.3.1

cpe:2.3:a:bouncycastle:bc-csharp:2.3.1
Bouncycastle » Bc-Csharp » Version: 2.4.0

cpe:2.3:a:bouncycastle:bc-csharp:2.4.0
Bouncycastle » Bc-Csharp » Version: 2.5.0

cpe:2.3:a:bouncycastle:bc-csharp:2.5.0
Bouncycastle » Bc-Csharp » Version: 2.5.1

cpe:2.3:a:bouncycastle:bc-csharp:2.5.1
Bouncycastle » Bc-Csharp » Version: 2.6.0

cpe:2.3:a:bouncycastle:bc-csharp:2.6.0
Bouncycastle » Bc-Csharp » Version: 2.6.1

cpe:2.3:a:bouncycastle:bc-csharp:2.6.1
Bouncycastle » Bc-Csharp » Version: 2.6.2

cpe:2.3:a:bouncycastle:bc-csharp:2.6.2

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-63576

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