Description
Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M11, from 10.1.0-M1 through 10.1.13, from 9.0.0-M1 through 9.0.81 and from 8.5.0 through 8.5.93 did not correctly parse HTTP trailer headers. A specially crafted, invalid trailer header could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected. Users are recommended to upgrade to version 11.0.0-M12 onwards, 10.1.14 onwards, 9.0.81 onwards or 8.5.94 onwards, which fix the issue.
Details
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| tomcat11 | — | — |
| tomcat6 | — | — |
| tomcat7 | — | — |
| tomcat8 | — | 8.5.39-1ubuntu1~18.04.3+esm5 |
| tomcat9 | — | 9.0.70-2ubuntu3 |
References
N/ASimilar Threats
- Unknown CLEANSTART-2026-KB11938
- Unknown DEBIAN-CVE-2026-24880
- Unknown CLEANSTART-2026-GR86205
- Unknown CLEANSTART-2026-TN71701
- Unknown DEBIAN-CVE-2026-24733
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