| Name | CVE-2026-42498 |
| Description | Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.2 through 9.0.117, from 8.5.24 through 8.5.100, from 7.0.83 through 7.0.109. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118, 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) | 10.1.52-1~deb12u1 | vulnerable |
| trixie (security), trixie | 10.1.52-1~deb13u1 | vulnerable | |
| forky, sid | 10.1.54-1 | vulnerable | |
| tomcat11 (PTS) | trixie (security), trixie | 11.0.15-1~deb13u1 | vulnerable |
| forky | 11.0.21-1 | vulnerable | |
| sid | 11.0.22-2 | fixed | |
| tomcat9 (PTS) | bullseye | 9.0.43-2~deb11u10 | vulnerable |
| bullseye (security) | 9.0.107-0+deb11u2 | 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) | |||
| tomcat11 | source | (unstable) | 11.0.22-1 | |||
| 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
Fixed by: https://github.com/apache/tomcat/commit/b7b173694d588ddcfa432f079baf763cbbbaa5c4 (11.0.22)
Fixed by: https://github.com/apache/tomcat/commit/6cbe274592ef2d11607b5b188e1df649de52f8d5 (10.1.55)
Fixed by: https://github.com/apache/tomcat/commit/169d725788ea6aec217ecac70fe4161c837ba423 (9.0.118)
https://lists.apache.org/thread/n61zwf75jrv09rz90j4jssncm244bwdb