CVE-2026-77756
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat caused by processing the transfer-encoding header for an HTTP/1.0 request may allow an attacker to cause one request from another user to fail when Tomcat is located behind a reverse proxy. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.47 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.67 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
- Score
- CVSS 3.1 3.7 Low
- Status
- Awaiting Analysis - security@apache.org
- Published
- 2026-09-23
- Last modified
- 2026-09-23
- Weaknesses
- CWE-444
Affected products
References
- https://lists.apache.org/thread/bl5b6rxqh3vb2k9bj2794vhor7o6xl3z
- http://www.openwall.com/lists/oss-security/2026/09/23/22
