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High severityNVD Advisory· Published Jul 3, 2024· Updated Nov 3, 2025

Apache Tomcat: HTTP/2 excess header handling DoS

CVE-2024-34750

Description

Improper Handling of Exceptional Conditions, Uncontrolled Resource Consumption vulnerability in Apache Tomcat. When processing an HTTP/2 stream, Tomcat did not handle some cases of excessive HTTP headers correctly. This led to a miscounting of active HTTP/2 streams which in turn led to the use of an incorrect infinite timeout which allowed connections to remain open which should have been closed.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.0-M20, from 10.1.0-M1 through 10.1.24, from 9.0.0-M1 through 9.0.89.

The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 though 8.5.100. Other EOL versions may also be affected.

Users are recommended to upgrade to version 11.0.0-M21, 10.1.25 or 9.0.90, which fixes the issue.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 11.0.0-M1, < 11.0.0-M2111.0.0-M21
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 10.1.0-M1, < 10.1.2510.1.25
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 9.0.0-M1, < 9.0.909.0.90
org.apache.tomcat:tomcat-coyoteMaven
>= 11.0.0-M1, < 11.0.0-M2111.0.0-M21
org.apache.tomcat:tomcat-coyoteMaven
>= 10.1.0-M1, < 10.1.2510.1.25
org.apache.tomcat:tomcat-coyoteMaven
>= 9.0.0-M1, < 9.0.909.0.90
org.apache.tomcat:tomcat-coyoteMaven
>= 8.5.0, <= 8.5.100—
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 8.5.0, <= 8.5.100—

Affected products

52

Patches

Vulnerability mechanics

References

11

News mentions

0

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