| Name | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1109113, 1109114 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| tomcat10 (PTS) | bookworm, bookworm (security) | 10.1.34-0+deb12u2 | vulnerable |
| trixie, sid | 10.1.40-1 | vulnerable | |
| tomcat11 (PTS) | trixie, sid | 11.0.6-1 | vulnerable |
| tomcat9 (PTS) | bullseye | 9.0.43-2~deb11u10 | vulnerable |
| bullseye (security) | 9.0.43-2~deb11u12 | vulnerable | |
| bookworm | 9.0.70-2 | fixed | |
| trixie, sid | 9.0.95-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| tomcat10 | source | (unstable) | (unfixed) | 1109114 | ||
| tomcat11 | source | (unstable) | (unfixed) | 1109113 | ||
| tomcat9 | source | (unstable) | 9.0.70-2 |
Starting with 9.0.70-2 src:tomcat9 no longer ships the server stack, using that as the fixed version
https://github.com/apache/tomcat/commit/be8f330f83ceddaf3baeed57522e571572b6b99b (11.0.9)
https://github.com/apache/tomcat/commit/2aa6261276ebe50b99276953591e3a2be7898bdb (10.1.43)
https://github.com/apache/tomcat/commit/434772930f362145516dd60681134e7f0cf8115b (9.0.107)