| Name | CVE-2026-66299 |
| Description | Uncontrolled Resource Consumption vulnerability in Apache Tomcat's WebSocket chat example. This issue affects Apache Tomcat: from 11.0.0-M20 through 11.0.24, from 10.1.24 through 10.1.57, from 9.0.89 through 9.0.120. Users who have followed the security guidance to remove the examples web application are not affected by this issue. Users are recommended to remove the examples web application or to upgrade to version 11.0.25, 10.1.58 or 9.0.121 (when released), which fix the issue. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| tomcat10 (PTS) | bookworm, bookworm (security) | 10.1.55-1~deb12u1 | vulnerable |
| trixie (security), trixie | 10.1.55-1~deb13u1 | vulnerable | |
| forky, sid | 10.1.55-1 | vulnerable | |
| tomcat11 (PTS) | trixie (security), trixie | 11.0.22-1~deb13u1 | vulnerable |
| forky, sid | 11.0.24-1 | vulnerable | |
| tomcat9 (PTS) | bullseye | 9.0.43-2~deb11u10 | vulnerable |
| bullseye (security) | 9.0.118-0+deb11u1 | fixed | |
| bookworm | 9.0.70-2 | fixed | |
| trixie | 9.0.95-1 | fixed | |
| forky, sid | 9.0.118-1 | 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) | unimportant | ||
| tomcat11 | source | (unstable) | (unfixed) | unimportant | ||
| tomcat9 | source | (unstable) | 9.0.70-2 | unimportant |
Starting with 9.0.70-2 src:tomcat9 no longer ships the server stack, using that as the fixed version
https://lists.apache.org/thread/8owczcc1o8qw1rxmg9gvfk4w2jnh4l5k
Only affects the WebSocket chat example