Apache Tomcat Improper Input Validation vulnerability
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.apache.tomcat.embed:tomcat-embed-core | >= 11.0.0-M1, < 11.0.0-M12, >= 10.1.0-M1, < 10.1.14, >= 9.0.0-M1, < 9.0.81, >= 8.5.0, < 8.5.94 | 11.0.0-M12, 10.1.14, 9.0.81, 8.5.94 |
| Java / Kotlin (Maven) | org.apache.tomcat:tomcat | >= 11.0.0-M1, < 11.0.0-M12, >= 10.1.0-M1, < 10.1.14, >= 9.0.0-M1, < 9.0.81, >= 8.5.0, < 8.5.94 | 11.0.0-M12, 10.1.14, 9.0.81, 8.5.94 |
| Java / Kotlin (Maven) | org.apache.tomcat:tomcat-coyote | >= 11.0.0-M1, < 11.0.0-M12, >= 10.1.0-M1, < 10.1.14, >= 9.0.0-M1, < 9.0.81, >= 8.5.0, < 8.5.94 | 11.0.0-M12, 10.1.14, 9.0.81, 8.5.94 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2023-45648
- https://github.com/apache/tomcat/commit/59583245639d8c42ae0009f4a4a70464d3ea70a0
- https://github.com/apache/tomcat/commit/8ecff306507be8e4fd3adee1ae5de1ea6661a8f4
- https://github.com/apache/tomcat/commit/c83fe47725f7ae9ae213568d9039171124fb7ec6
- https://github.com/apache/tomcat/commit/eb5c094e5560764cda436362254997511a3ca1f6
- https://github.com/apache/tomcat
- https://lists.apache.org/thread/2pv8yz1pyp088tsxfb7ogltk9msk0jdp
- https://lists.debian.org/debian-lts-announce/2023/10/msg00020.html
- https://security.netapp.com/advisory/ntap-20231103-0007
- https://www.debian.org/security/2023/dsa-5521
- https://www.debian.org/security/2023/dsa-5522
- http://www.openwall.com/lists/oss-security/2023/10/10/10
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N- Weakness (CWE)
CWE-20- Platform
- Java / Kotlin (Maven)
- Package
org.apache.tomcat.embed:tomcat-embed-core, org.apache.tomcat:tomcat, org.apache.tomcat:tomcat-coyote- Disclosed
- 10.10.2023
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-r6j3-px5g-cq3x - CC BY 4.0
Vulnerability history: org.apache.tomcat:tomcat-coyote
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 33
- First → latest
- 06.2020 05.2026
- Without a fix
- 0
- Exploited in attacks
- 1
Severity breakdown
- Critical 2
- High 17
- Medium 13
- Low 1
Disclosures per year
- 2020: 1
- 2021: 1
- 2022: 8
- 2023: 7
- 2024: 5
- 2025: 4
- 2026: 7
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Apache Tomcat Improper Input Validation vulnerability this entry
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