CVE-2023-46589

Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82 and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit 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-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.

Scoring

Severity

HIGH

CVSS base score

7.5

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS probability

56.30%

CWE

CWE-444

Published

2023-11-28

Last modified

2026-09-17

Affected products

• Apache Software Foundation Apache Tomcat
• Apache Software Foundation Apache Tomcat
• Apache Software Foundation Apache Tomcat
• Apache Software Foundation Apache Tomcat
• Apache Software Foundation Apache Tomcat
• Apache Software Foundation Apache Tomcat

Weakness type

• CWE-444

Related vulnerabilities

• CVE-2026-48710 — Starlette has missing Host header validation that poisons request.url.path, bypassing path-based security checks
• CVE-2023-33193 — Emby Server Proxy Header Spoofing Vulnerability
• CVE-2025-1867 — HTTP Response Smuggling Vulnerability in libhv
• CVE-2024-41110 — Moby authz zero length regression
• CVE-2023-46846 — Squid: request/response smuggling in http/1.1 and icap
• CVE-2024-27922 — HTTP Handling Vulnerability in the Bare server
• CVE-2026-28497 — TinyWeb: Integer Overflow in `_Val` (HTTP Request Smuggling)
• CVE-2026-2835 — HTTP Request Smuggling via HTTP/1.0 and Transfer-Encoding Misparsing

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