CVE-2024-34750Apache Tomcat: HTTP/2 excess header handling DoS

Official 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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://lists.apache.org/thread/4kqf0bc9gxymjc2x7v3p7dvplnl77y8l vendor-advisory
• https://security.netapp.com/advisory/ntap-20240816-0004/
• https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html