High · published August 26, 2026
Uncontrolled Resource Consumption vulnerability in Apache Tomcat via an allocation leak in the HTTP/2 backlog tracking when a stream is reset
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.39 through 9.0.120.
The following versions were EOL at the time the CVE was created but are
known to be affected: from 8.5.59 through 8.5.100. Other unsupported versions may also be affected.
Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.
| Product | Versions | Fixed in |
|---|---|---|
| apache/tomcat | ≥ 8.5.59, < 9.0.121 | 9.0.121 |
| apache/tomcat | ≥ 10.1.0, < 10.1.58 | 10.1.58 |
| apache/tomcat | ≥ 11.0.0, < 11.0.25 | 11.0.25 |