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Medium

Potential HTTP request smuggling in Apache Tomcat

  • Disclosed: 28.02.2020
  • Updated: 11.10.2026 12:22

In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Java / Kotlin (Maven) org.apache.tomcat.embed:tomcat-embed-core < 7.0.100, >= 8.0.0, < 8.5.51, >= 9.0.0, < 9.0.31 7.0.100, 8.5.51, 9.0.31
Java / Kotlin (Maven) org.apache.tomcat:tomcat < 7.0.100, >= 8.0.0, < 8.5.51, >= 9.0.0, < 9.0.31 7.0.100, 8.5.51, 9.0.31

References

CVSS score 4.8/10
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness (CWE)
CWE-444
Platform
Java / Kotlin (Maven)
Package
org.apache.tomcat.embed:tomcat-embed-core, org.apache.tomcat:tomcat
Disclosed
28.02.2020
Updated
11.10.2026 12:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-qxf4-chvg-4r8r - CC BY 4.0

Vulnerability history: org.apache.tomcat:tomcat

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.

All (162) in the archive
Total entries
162
First → latest
12.2018 08.2026
Without a fix
20
Exploited in attacks
1

Severity breakdown

  • Critical 8
  • High 40
  • Medium 102
  • Low 12

Disclosures per year

Severity:
  1. Potential HTTP request smuggling in Apache Tomcat this entry
    Medium · 4.8 CVE-2020-1935 < 7.0.100, >= 8.0.0, < 8.5.51, >= 9.0.0, < 9.0.31 7.0.100, 8.5.51, 9.0.31
  2. Apache Tomcat's DIGEST authenticator has an Authentication Bypass by Capture-replay vulnerability
    Critical · 9.8 CVE-2026-65905 >= 11.0.0-M1, < 11.0.25, >= 10.1.0-M1, < 10.1.58, >= 9.0.0.M1, < 9.0.121, >= 8.5.0, <= 8.5.100, >= 7.0.30, <= 7.0.109 11.0.25, 10.1.58, 9.0.121
  3. Apache Tomcat has an Improper Access Control, Incorrect Authorization vulnerability
    Critical · 9.1 CVE-2026-65182 >= 11.0.0-M1, < 11.0.25, >= 10.1.0-M1, < 10.1.58, >= 9.0.0-M1, < 9.0.121, >= 8.5.0, <= 8.5.100, >= 7.0.0, <= 7.0.109 11.0.25, 10.1.58, 9.0.121
  4. Apache Tomcat's FORM authentication process has an Incorrect Authorization vulnerability
    Critical · 9.1 CVE-2026-68525 >= 11.0.0-M1, < 11.0.25, >= 10.1.0-M1, < 10.1.58, >= 9.0.0-M1, < 9.0.121, >= 8.5.0, <= 8.5.100, >= 7.0.0, <= 7.0.109 11.0.25, 10.1.58, 9.0.121
  5. Apache Tomcat: Unbounded read in WebDAV LOCK and PROPFIND handling
    High · 7.5 CVE-2026-41284 < 9.0.118, >= 10.1.0-M1, < 10.1.55, >= 11.0.0-M1, < 11.0.22 9.0.118, 10.1.55, 11.0.22
  6. Apache Tomcat - Digest authenticator will authenticate any unknown user
    Critical · 9.8 CVE-2026-43512 < 9.0.118, >= 10.1.0-M1, < 10.1.55, >= 11.0.0-M1, < 11.0.22 9.0.118, 10.1.55, 11.0.22
  7. Apache Tomcat: LockOutRealm treats user names as case-sensitive
    High · 7.5 CVE-2026-43513 < 9.0.118, >= 10.1.0-M1, < 10.1.55, >= 11.0.0-M1, < 11.0.22 9.0.118, 10.1.55, 11.0.22
  8. Apache Tomcat - Security constraints not correctly applied
    Critical · 9.1 CVE-2026-43515 < 9.0.118, >= 10.1.0-M1, < 10.1.55, >= 11.0.0-M1, < 11.0.22 9.0.118, 10.1.55, 11.0.22
  9. Apache Tomcat - WebSocket authentication header exposure
    High · 7.3 CVE-2026-42498 < 9.0.118, >= 10.1.0-M1, < 10.1.55, >= 11.0.0-M1, < 11.0.22 9.0.118, 10.1.55, 11.0.22
  10. Apache Tomcat - HTTP/2 request headers not validated
    Critical · 9.8 CVE-2026-41293 >= 8.5.0, < 9.0.118, >= 10.1.0-M1, < 10.1.55, >= 11.0.0-M1, < 11.0.22 9.0.118, 10.1.55, 11.0.22
  11. Apache Tomcat vulnerable to Insertion of Sensitive Information into Log File
    High · 7.5 CVE-2026-34487 >= 9.0.13, < 9.0.117, >= 10.1.0-M1, < 10.1.54, >= 11.0.0-M1, < 11.0.21 9.0.117, 10.1.54, 11.0.21
  12. Apache Tomcat has an Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve
    High · 7.5 CVE-2026-34483 >= 9.0.40, < 9.0.116, >= 10.1.0-M1, < 10.1.54, >= 11.0.0-M1, < 11.0.21 9.0.116, 10.1.54, 11.0.21
  13. Apache Tomcat Missing Encryption of Sensitive Data vulnerability
    High · 7.5 Exploited in attacks CVE-2026-34486 >= 11.0.20, < 11.0.21, >= 10.1.53, < 10.1.54, >= 9.0.116, < 9.0.117 11.0.21, 10.1.54, 9.0.117
  14. Apache Tomcat: Padding Oracle vulnerability in EncryptInterceptor
    High · 7.5 CVE-2026-29146 >= 9.0.13, < 9.0.116, >= 10.1.50, < 10.1.53, >= 11.0.0-M1, < 11.0.20, >= 8.5.38, <= 8.5.100, >= 7.0.100, <= 7.0.109 9.0.116, 10.1.53, 11.0.20
  15. Apache Tomcat: CLIENT_CERT authentication does not fail as expected
    Critical · 9.1 CVE-2026-29145 >= 9.0.83, < 9.0.116, >= 10.1.0-M7, < 10.1.53, >= 11.0.0-M1, < 11.0.20 9.0.116, 10.1.53, 11.0.20
  16. Apache Tomcat: Configured cipher preference order not preserved
    High · 7.5 CVE-2026-29129 >= 9.0.114, < 9.0.116, >= 10.1.51, < 10.1.53, >= 11.0.16, < 11.0.20 9.0.116, 10.1.53, 11.0.20
  17. Apache Tomcat Vulnerable to Relative Path Traversal
    High · 7.5 CVE-2025-55752 >= 11.0.0-M1, < 11.0.11, >= 10.1.0-M1, < 10.1.45, >= 9.0.0-M11, < 9.0.109, >= 8.5.6, <= 8.5.100 11.0.11, 10.1.45, 9.0.109
  18. Deserialization of Untrusted Data in Apache Tomcat
    High CVE-2013-2185 < 7.0.39 7.0.39
  19. Improper Neutralization of Input During Web Page Generation in Apache Tomcat
    High · 8.1 CVE-2015-5346 >= 9.0.0.M1, < 9.0.0.M2, >= 8.0.0.RC1, < 8.0.31, >= 7.0.0, < 7.0.66 9.0.0.M2, 8.0.31, 7.0.66
  20. Apache Tomcat allows remote attackers to bypass a CSRF protection mechanism by using a token
    High · 8.8 CVE-2015-5351 < 7.0.68, >= 8.0.0, < 8.0.31, >= 9.0.0.M0, < 9.0.0.M2 7.0.68, 8.0.31, 9.0.0.M2
  21. Apache Tomcat does not enforce the maxHttpHeaderSize limit
    High · 7.5 CVE-2011-0534 >= 6.0.0, < 6.0.32, >= 7.0.0, < 7.0.8 6.0.32, 7.0.8
  22. Apache Tomcat Allows Remote Attackers to Spoof AJP Requests
    High CVE-2011-3190 >= 7.0.0, < 7.0.21, >= 6.0.0, < 6.0.34, >= 5.0.0, < 5.5.34 7.0.21, 6.0.34, 5.5.34
  23. Uncontrolled Resource Consumption in Apache Tomcat
    High CVE-2014-0230 >= 6.0.0, < 6.0.44, >= 7.0.0, < 7.0.55, >= 8.0.0, < 8.0.9 6.0.44, 7.0.55, 8.0.9
  24. Improper Access Control in Apache Tomcat
    High · 8.8 CVE-2016-0714 >= 9.0.0.M1, < 9.0.0.M2, >= 8.0.0.RC1, < 8.0.32, >= 7.0.0, < 7.0.70, >= 6.0.0, < 6.0.46 9.0.0.M2, 8.0.32, 7.0.70, 6.0.46
  25. Improper Restriction of Operations within the Bounds of a Memory Buffer in Apache Tomcat
    High · 7.5 CVE-2016-6817 >= 9.0.0.M1, < 9.0.0.M12, >= 8.5.0, < 8.5.8 9.0.0.M12, 8.5.8
  26. Exposure of Sensitive Information to an Unauthorized Actor in Apache Tomcat
    High · 7.5 CVE-2017-5647 >= 9.0.0.M1, < 9.0.0.M19, >= 8.5.0, < 8.5.13, >= 8.0.0, < 8.0.43, >= 7.0.0, < 7.0.77, >= 6.0.0, < 6.0.53 9.0.0.M19, 8.5.13, 8.0.43, 7.0.77, 6.0.53
  27. Apache Tomcat allows remote attackers to read data that was intended to be associated with a different request
    High · 7.5 CVE-2016-8747 >= 8.5.7, < 8.5.10, >= 9.0.0.M11, < 9.0.0.M16 8.5.10, 9.0.0.M16
  28. Improper Limitation of a Pathname to a Restricted Directory in Apache Tomcat
    High · 7.5 CVE-2017-7675 >= 9.0.0.M1, < 9.0.0.M22, >= 8.5.0, < 8.5.16 9.0.0.M22, 8.5.16
  29. Improper socket reuse in Apache Tomcat
    High · 8.6 CVE-2022-25762 >= 8.5.0, < 8.5.75, >= 9.0.0M1, < 9.0.20 8.5.75, 9.0.20
  30. Improper Handling of Exceptional Conditions in Apache Tomcat
    High · 7.5 CVE-2017-5664 >= 9.0.0.M1, < 9.0.0.M21, >= 8.5.0, < 8.5.15, >= 8.0.0, < 8.0.44, >= 7.0.0, < 7.0.78 9.0.0.M21, 8.5.15, 8.0.44, 7.0.78
  31. Improper Resource Shutdown or Release in Apache Tomcat
    High · 7.5 CVE-2017-5650 >= 9.0.0.M1, < 9.0.0.M19, >= 8.5.0, < 8.5.13 9.0.0.M19, 8.5.13
  32. Apache Tomcat vulnerable to SecurityManager bypass
    High · 7.5 CVE-2016-6796 >= 9.0.0.M1, < 9.0.0.M10, >= 8.5.0, < 8.5.5, >= 8.0.0.RC1, < 8.0.37, >= 7.0.0, < 7.0.71, >= 6.0.0, < 6.0.46 9.0.0.M10, 8.5.5, 8.0.37, 7.0.71, 6.0.46
  33. Incorrect Authorization in Apache Tomcat
    High · 7.5 CVE-2016-6797 >= 9.0.0.M1, < 9.0.0.M10, >= 8.5.0, < 8.5.5, >= 8.0.0, < 8.0.37, >= 7.0.0, < 7.0.72 9.0.0.M10, 8.5.5, 8.0.37, 7.0.72
  34. Apache Tomcat EncryptInterceptor error leads to Uncontrolled Resource Consumption
    High · 7.5 CVE-2022-29885 >= 10.1.0-M1, < 10.1.0-M15, >= 10.0.0-M1, < 10.0.21, >= 9.0.13, < 9.0.63, >= 8.5.38, < 8.5.79 10.1.0-M15, 10.0.21, 9.0.63, 8.5.79
  35. Apache Tomcat affected by vulnerability in TLS and SSL protocol
    Critical · 9.8 CVE-2009-3555 >= 7.0.0, < 7.0.10, >= 6.0.0, < 6.0.32, >= 5.0.0, < 5.5.33 7.0.10, 6.0.32, 5.5.33
  36. Apache Tomcat Buffer Over-Read
    High CVE-2006-7197 <= 5.5.15 no fix
  37. Apache Tomcat allows remote attackers to read JSP source files
    High CVE-2005-4836 >= 4.1.15, <= 4.1.40 no fix
  38. Apache Tomcat Vulnerable to Denial of Service (DoS) via Simultaneous Requests
    High CVE-2005-3510 >= 5.5.0, < 5.5.12 5.5.12
  39. Apache Tomcat DoS via Malicious Get Request
    High CVE-2002-2272 >= 4.0.0, <= 4.1.12 no fix
  40. Apache Tomcat Source Code Disclosure
    High CVE-2002-1394 < 4.0.6 4.0.6
  41. Apache Tomcat may be started without proper security settings
    High CVE-2002-0493 < 4.0b7 4.0b7
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