GHSA-fpj8-gq4v-p354

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    GHSA-fpj8-gq4v-p354

    Published: 17 Feb 2026Last Modified: 11 Sept 2026

    Summary: Apache Tomcat - Client certificate verification bypass

    Details: Improper Input Validation vulnerability. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through 10.1.49, from 9.0.0-M1 through 9.0.112. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Older EOL versions are not affected. Tomcat did not validate that the host name provided via the SNI extension was the same as the host name provided in the HTTP host header field. If Tomcat was configured with more than one virtual host and the TLS configuration for one of those hosts did not require client certificate authentication but another one did, it was possible for a client to bypass the client certificate authentication by sending different host names in the SNI extension and the HTTP host header field. The vulnerability only applies if client certificate authentication is only enforced at the Connector. It does not apply if client certificate authentication is enforced at the web application. Users are recommended to upgrade to version 11.0.15 or later, 10.1.50 or later or 9.0.113 or later, which fix the issue.

    References: https://nvd.nist.gov/vuln/detail/CVE-2025-66614, https://github.com/apache/tomcat/commit/152c14885d45f5e0a8b59bd9f93c289cfe20ce30, https://github.com/apache/tomcat/commit/258a591b61f8cf5c22109e21e5a2a38b63454fd2, https://github.com/apache/tomcat/commit/5053fa82a1b2b52756810601227984a8b71888a4, https://github.com/apache/tomcat/commit/9276b5e783c8cd5b3fe2bb716306b65004bdd940, https://github.com/apache/tomcat/commit/972f9a5e2a07674d92610c478aac1b205d60724e, https://github.com/apache/tomcat/commit/a4aa74232e826028cd2f7ba0445caf8a8b52c509, https://github.com/apache/tomcat, https://lists.apache.org/thread/vw6lxtlh2qbqwpb61wd3sv1flm2nttw7, https://tomcat.apache.org/security-10.html, https://tomcat.apache.org/security-11.html, https://tomcat.apache.org/security-9.html

    Affected packages

    Package

    Name: org.apache.tomcat.embed:tomcat-embed-core

    Purl: pkg:maven/org.apache.tomcat.embed/tomcat-embed-core

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 11.0.0-M1
    Fixed -11.0.15

    Affected versions

    11.0.0
    11.0.0-M1
    11.0.0-M10
    11.0.0-M11
    11.0.0-M12
    11.0.0-M13
    11.0.0-M14
    11.0.0-M15
    11.0.0-M16
    11.0.0-M17
    11.0.0-M18
    11.0.0-M19
    11.0.0-M20
    11.0.0-M21
    11.0.0-M22
    11.0.0-M24
    11.0.0-M25
    11.0.0-M26
    11.0.0-M3
    11.0.0-M4
    11.0.0-M5
    11.0.0-M6
    11.0.0-M7
    11.0.0-M9
    11.0.1
    11.0.10
    11.0.11
    11.0.12
    11.0.13
    11.0.14
    11.0.2
    11.0.3
    11.0.4
    11.0.5
    11.0.6
    11.0.7
    11.0.8
    11.0.9

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    GHSA-fpj8-gq4v-p354 | CVE-DB