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High severityNVD Advisory· Published Nov 28, 2023· Updated Oct 29, 2025

Apache Tomcat: HTTP request smuggling via malformed trailer headers

CVE-2023-46589

Description

Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82 and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy.

Older, EOL versions may also be affected.

Users are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
org.apache.tomcat:tomcat-catalinaMaven
>= 11.0.0-M1, < 11.0.0-M1111.0.0-M11
org.apache.tomcat:tomcat-catalinaMaven
>= 10.1.0-M1, < 10.1.1610.1.16
org.apache.tomcat:tomcat-catalinaMaven
>= 9.0.0-M1, < 9.0.839.0.83
org.apache.tomcat:tomcat-catalinaMaven
>= 8.5.0, < 8.5.968.5.96
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 11.0.0-M1, < 11.0.0-M1111.0.0-M11
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 10.1.0-M1, < 10.1.1610.1.16
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 9.0.0-M1, < 9.0.839.0.83
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 8.5.0, < 8.5.968.5.96

Affected products

39

Patches

Vulnerability mechanics

References

15

News mentions

0

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