CVE-2025-53506

Description

Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.0.0.M1 through 9.0.106. Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.

Reserved 2025-07-01 | Published 2025-07-10 | Updated 2025-07-11 | Assigner apache

Problem types

CWE-400 Uncontrolled Resource Consumption

Product status

Default status
unaffected

11.0.0-M1
affected

10.1.0-M1
affected

9.0.0.M1
affected

Credits

Kanatoko finder

References

lists.apache.org/thread/p09775q0rd185m6zz98krg0fp45j8kr0 vendor-advisory

cve.org (CVE-2025-53506)

nvd.nist.gov (CVE-2025-53506)

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