AIKIDO-2026-983621
tomcat-embed-core is vulnerable to Improper Input Validation
65
Medium Risk
This Affects:
tomcat-embed-coreTL;DR
tomcat-embed-core does not fully enforce strict SNI checks for HTTP/2 requests that omit an authority. A client can send a no-authority HTTP/2 request and skip the intended host match. That can route the request to the wrong virtual host. The fix requires every HTTP/2 request to provide an authority.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and HTTP/2 is enabled with strict SNI validation.
Background info
tomcat-embed-core is vulnerable to Improper Input Validation in versions 9.0.115 - 9.0.120, 10.1.53 - 10.1.57 and 11.0.20 - 11.0.24.
How to fix this
Upgrade the org.apache.tomcat.embed:tomcat-embed-core library to the patch version.
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