CVE-2025-53506

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

Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.

References

Affected packages

Git / github.com/apache/tomcat

Affected ranges

Type

GIT

Repo

https://github.com/apache/tomcat

Events

Introduced

16bf392c67833ad549733b58c350ff92b5ee782a

Last affected

05ccf0c3e22d388f0cf853e32485d8249d051f2f

Introduced

e9d17cddc285615807ec5fef09240777436b25dc

Last affected

0289da4f342744334e0fc5a53ee958e68024fead

Introduced

56e547d387ab49f688c93fe9ca082b1b5d94deed

Last affected

8a48dcb90f13f1670632e763e945f4cc9ef869e6

Database specific

{
    "versions": [
        {
            "introduced": "9.0.0"
        },
        {
            "last_affected": "9.0.106"
        },
        {
            "introduced": "10.1.0"
        },
        {
            "last_affected": "10.1.42"
        },
        {
            "introduced": "11.0.0"
        },
        {
            "last_affected": "11.0.8"
        }
    ]
}

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-53506.json"