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High

Apache Tomcat Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability

  • Disclosed: 20.12.2024
  • Updated: 11.10.2026 13:20

Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.1, from 10.1.0-M1 through 10.1.33, from 9.0.0.M1 through 9.0.97.

The mitigation for CVE-2024-50379 was incomplete.

Users running Tomcat on a case insensitive file system with the default servlet write enabled (readonly initialisation parameter set to the non-default value of false) may need additional configuration to fully mitigate CVE-2024-50379 depending on which version of Java they are using with Tomcat:

  • running on Java 8 or Java 11: the system property sun.io.useCanonCaches must be explicitly set to false (it defaults to true)
  • running on Java 17: the system property sun.io.useCanonCaches, if set, must be set to false (it defaults to false)
  • running on Java 21 onwards: no further configuration is required (the system property and the problematic cache have been removed)

Tomcat 11.0.3, 10.1.35 and 9.0.99 onwards will include checks that sun.io.useCanonCaches is set appropriately before allowing the default servlet to be write enabled on a case insensitive file system. Tomcat will also set sun.io.useCanonCaches to false by default where it can.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Java / Kotlin (Maven) org.apache.tomcat.embed:tomcat-embed-core >= 11.0.0-M1, < 11.0.2, >= 10.1.0-M1, < 10.1.34, >= 9.0.0.M1, < 9.0.98 11.0.2, 10.1.34, 9.0.98
Java / Kotlin (Maven) org.apache.tomcat:tomcat-catalina >= 11.0.0-M1, < 11.0.2, >= 10.1.0-M1, < 10.1.34 11.0.2, 10.1.34
Java / Kotlin (Maven) org.apache.tomcat:tomcat-embed-core >= 9.0.0.M1, < 9.0.98 9.0.98

References

CVSS score -
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
Weakness (CWE)
CWE-367
Platform
Java / Kotlin (Maven)
Package
org.apache.tomcat.embed:tomcat-embed-core, org.apache.tomcat:tomcat-catalina, org.apache.tomcat:tomcat-embed-core
Disclosed
20.12.2024
Updated
11.10.2026 13:20

Sources and licenses

OSV / GitHub Advisory Database - GHSA-27hp-xhwr-wr2m - CC BY 4.0

Vulnerability history: org.apache.tomcat.embed:tomcat-embed-core

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 (77) in the archive
Total entries
77
First → latest
10.2018 08.2026
Without a fix
0
Exploited in attacks
5

Severity breakdown

  • Critical 11
  • High 36
  • Medium 25
  • Low 5

Disclosures per year

Severity:
  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. Apache Tomcat has an HTTP Request/Response Smuggling vulnerability
    High · 7.5 CVE-2026-24880 >= 7.0.0, < 9.0.116, >= 10.1.0-M1, < 10.1.52, >= 11.0.0-M1, < 11.0.20 9.0.116, 10.1.52, 11.0.20
  13. 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
  14. Apache Tomcat has an Improper Input Validation vulnerability
    High · 7.5 CVE-2026-24734 >= 11.0.0-M1, < 11.0.18, >= 10.1.0-M7, < 10.1.52, >= 9.0.83, < 9.0.115 11.0.18, 10.1.52, 9.0.115
  15. 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
  16. Apache Tomcat Improper Resource Shutdown or Release vulnerability
    High · 7.5 CVE-2025-48989 >= 11.0.0-M1, < 11.0.10, >= 10.1.0-M1, < 10.1.44, >= 9.0.0.M1, < 9.0.108 11.0.10, 10.1.44, 9.0.108
  17. Apache Tomcat Coyote vulnerable to Denial of Service via excessive HTTP/2 streams
    High · 7.5 CVE-2025-53506 >= 8.5.0, <= 8.5.100, >= 9.0.0.M1, < 9.0.107, >= 10.1.0-M1, < 10.1.43, >= 11.0.0-M1, < 11.0.9 9.0.107, 10.1.43, 11.0.9
  18. Apache Tomcat Catalina is vulnerable to DoS attack through bypassing of size limits
    High · 7.5 CVE-2025-52520 >= 11.0.0-M1, < 11.0.9, >= 10.1.0-M1, < 10.1.43, >= 9.0.0.M1, < 9.0.107, >= 8.5.0, <= 8.5.100 11.0.9, 10.1.43, 9.0.107
  19. Apache Tomcat - DoS in multipart upload
    High · 7.5 CVE-2025-48988 >= 11.0.0-M1, < 11.0.8, >= 10.1.0-M1, < 10.1.42, >= 9.0.0.M1, < 9.0.106, >= 8.5.0, <= 8.5.100 11.0.8, 10.1.42, 9.0.106
  20. Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUT
    Critical · 9.8 Exploited in attacks CVE-2025-24813 >= 11.0.0-M1, < 11.0.3, >= 10.1.0-M1, < 10.1.35, >= 9.0.0.M1, < 9.0.99, >= 8.5.0, <= 8.5.100 11.0.3, 10.1.35, 9.0.99
  21. Apache Tomcat Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability this entry
    High CVE-2024-56337 >= 11.0.0-M1, < 11.0.2, >= 10.1.0-M1, < 10.1.34, >= 9.0.0.M1, < 9.0.98 11.0.2, 10.1.34, 9.0.98
  22. Apache Tomcat Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability
    High · 9.8 CVE-2024-50379 >= 11.0.0-M1, < 11.0.2, >= 10.1.0-M1, < 10.1.34, >= 9.0.0.M1, < 9.0.98, >= 8.5.0, <= 8.5.100 11.0.2, 10.1.34, 9.0.98
  23. Apache Tomcat Allocation of Resources Without Limits or Throttling vulnerability
    High · 8.6 CVE-2024-38286 >= 11.0.0-M1, < 11.0.0-M21, >= 10.1.0-M1, < 10.1.25, >= 9.0.13, < 9.0.90, >= 8.5.35, <= 8.5.100, >= 7.0.92, <= 7.0.109 11.0.0-M21, 10.1.25, 9.0.90
  24. Apache Tomcat - Denial of Service
    High · 7.5 CVE-2024-34750 >= 11.0.0-M1, < 11.0.0-M21, >= 10.1.0-M1, < 10.1.25, >= 9.0.0-M1, < 9.0.90, >= 8.5.0, <= 8.5.100 11.0.0-M21, 10.1.25, 9.0.90
  25. Apache Tomcat Improper Input Validation vulnerability
    High · 7.5 CVE-2023-46589 >= 11.0.0-M1, < 11.0.0-M11, >= 10.1.0-M1, < 10.1.16, >= 9.0.0-M1, < 9.0.83, >= 8.5.0, < 8.5.96 11.0.0-M11, 10.1.16, 9.0.83, 8.5.96
  26. Apache Tomcat - Fix for CVE-2023-24998 was incomplete
    High · 7.5 CVE-2023-28709 >= 11.0.0-M2, < 11.0.0-M5, >= 10.1.5, < 10.1.8, >= 9.0.71, < 9.0.74 11.0.0-M5, 10.1.8, 9.0.74
  27. Apache Tomcat vulnerable to information leak
    High · 7.5 CVE-2023-34981 >= 11.0.0-M5, < 11.0.0-M6, >= 10.1.8, < 10.1.9, >= 9.0.74, < 9.0.75 11.0.0-M6, 10.1.9, 9.0.75
  28. Apache Commons FileUpload denial of service vulnerability
    High · 7.5 CVE-2023-24998 >= 10.1.0-M1, < 10.1.5, >= 11.0.0-M2, < 11.0.0-M5, >= 8.5.85, < 8.5.88, >= 9.0.0-M1, < 9.0.71 10.1.5, 11.0.0-M5, 8.5.88, 9.0.71
  29. Apache Tomcat improperly escapes input from JsonErrorReportValve
    High · 7.5 CVE-2022-45143 >= 8.5.83, < 8.5.84, >= 9.0.40, < 9.0.69, >= 10.1.0, < 10.1.2 8.5.84, 9.0.69, 10.1.2
  30. Apache Tomcat may reject request containing invalid Content-Length header
    High · 7.5 CVE-2022-42252 >= 8.5.0, < 8.5.83, >= 9.0.0-M1, < 9.0.68, >= 10.0.0-M1, < 10.0.27, >= 10.1.0-M1, < 10.1.1 8.5.83, 9.0.68, 10.0.27, 10.1.1
  31. Unrestricted Upload of File with Dangerous Type Apache Tomcat
    High · 8.1 Exploited in attacks CVE-2017-12617 >= 9.0.0.M1, < 9.0.1, >= 8.5.0, < 8.5.23, >= 8.0.0-RC1, < 8.0.47, >= 7.0.0, < 7.0.82 9.0.1, 8.5.23, 8.0.47, 7.0.82
  32. Expected Behavior Violation in Apache Tomcat
    Critical · 9.8 CVE-2017-5651 >= 9.0.0.M1, < 9.0.0.M19, >= 8.5.0, < 8.5.13 9.0.0.M19, 8.5.13
  33. Exposure of Resource to Wrong Sphere in Apache Tomcat
    Critical · 9.1 CVE-2017-5648 >= 9.0.0.M1, < 9.0.0.M18, >= 8.5.0, < 8.5.13, >= 8.0.0, < 8.0.42, >= 7.0.0, < 7.0.76 9.0.0.M18, 8.5.13, 8.0.42, 7.0.76
  34. Uncontrolled Resource Consumption in Apache Tomcat
    High · 7.5 CVE-2020-11996 >= 10.0.0-M1, < 10.0.0-M5, >= 9.0.0.M1, < 9.0.35, >= 8.5.0, < 8.5.55 10.0.0-M5, 9.0.35, 8.5.55
  35. Exposure of Sensitive Information to an Unauthorized Actor in Apache Tomcat
    High · 7.5 CVE-2021-25122 >= 10.0.0-M1, < 10.0.2, >= 9.0.0-M1, < 9.0.43, >= 8.5.0, < 8.5.63 10.0.2, 9.0.43, 8.5.63
  36. Potential remote code execution in Apache Tomcat
    High · 7.0 CVE-2021-25329 >= 10.0.0-M1, < 10.0.2, >= 9.0.0, < 9.0.41, >= 8.0.0, < 8.5.61, >= 7.0.0, < 7.0.108 10.0.2, 9.0.41, 8.5.61, 7.0.108
  37. Improper Privilege Management in Tomcat
    Critical · 9.8 Exploited in attacks CVE-2020-1938 >= 9.0.0, < 9.0.31, >= 8.0.0, < 8.5.51, >= 7.0.0, < 7.0.100 9.0.31, 8.5.51, 7.0.100
  38. Apache Tomcat Denial of Service vulnerability
    High · 7.5 CVE-2019-0199 >= 9.0.0, < 9.0.16, >= 8.0.0, < 8.5.38 9.0.16, 8.5.38
  39. Potential remote code execution in Apache Tomcat
    High · 7.0 CVE-2020-9484 >= 10.0.0-M1, < 10.0.0-M5, >= 9.0.0, < 9.0.35, >= 8.0.0, < 8.5.55, >= 7.0.0, < 7.0.104 10.0.0-M5, 9.0.35, 8.5.55, 7.0.104
  40. Insufficiently Protected Credentials in Apache Tomcat
    High · 7.0 CVE-2019-12418 < 7.0.99, >= 8.0.0, < 8.5.49, >= 9.0.0, < 9.0.29 7.0.99, 8.5.49, 9.0.29
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