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Servers and applications

CVE-2026-24733

Improper Input Validation vulnerability in Apache Tomcat. Tomcat did not limit HTTP/0.9 requests to the GET method. If a security constraint was configured to allow HEAD requests to a URI but deny GET requests, the user could bypass that constraint on GET requests by sending a (specification invalid) HEAD request using HTTP/0.9. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14,…

Severity
Low 3.7
Published
17 Feb 2026
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Fixed in
9.0.113, 10.1.50, 11.0.15
Sources
NVD

Affected software

SoftwareAffected versions
Apache TomcatServers and applications · cpe:a:apache:tomcat
  • From 11.0.1 before 11.0.15
  • Version 11.0.0-milestone26
  • Version 11.0.0-milestone25
  • Version 11.0.0-milestone24
All 66 release lines
  • Version 9.0.0-milestone1
  • Version 9.0.0-milestone2
  • Version 9.0.0-milestone3
  • Version 9.0.0-milestone4
  • Version 9.0.0-milestone5
  • Version 9.0.0-milestone6
  • Version 9.0.0-milestone7
  • Version 9.0.0-milestone8
  • Version 9.0.0-milestone9
  • Version 9.0.0-milestone10
  • Version 9.0.0-milestone11
  • Version 9.0.0-milestone12
  • Version 9.0.0-milestone13
  • Version 9.0.0-milestone14
  • Version 9.0.0-milestone15
  • Version 9.0.0-milestone16
  • Version 9.0.0-milestone17
  • Version 9.0.0-milestone18
  • Version 9.0.0-milestone19
  • Version 9.0.0-milestone20
  • Version 9.0.0-milestone21
  • Version 9.0.0-milestone22
  • Version 9.0.0-milestone23
  • Version 9.0.0-milestone24
  • Version 9.0.0-milestone25
  • Version 9.0.0-milestone26
  • Version 9.0.0-milestone27
  • From 9.0.1 before 9.0.113
  • Version 10.0.0-milestone1
  • Version 10.0.0-milestone2
  • Version 10.0.0-milestone3
  • Version 10.0.0-milestone4
  • Version 10.0.0-milestone5
  • Version 10.0.0-milestone6
  • Version 10.0.0-milestone7
  • Version 10.0.0-milestone8
  • Version 10.0.0-milestone9
  • Version 10.0.0-milestone10
  • From 10.1.1 before 10.1.50
  • Version 11.0.0-milestone1
  • Version 11.0.0-milestone2
  • Version 11.0.0-milestone3
  • Version 11.0.0-milestone4
  • Version 11.0.0-milestone5
  • Version 11.0.0-milestone6
  • Version 11.0.0-milestone7
  • Version 11.0.0-milestone8
  • Version 11.0.0-milestone9
  • Version 11.0.0-milestone10
  • Version 11.0.0-milestone11
  • Version 11.0.0-milestone12
  • Version 11.0.0-milestone13
  • Version 11.0.0-milestone14
  • Version 11.0.0-milestone15
  • Version 11.0.0-milestone16
  • Version 11.0.0-milestone17
  • Version 11.0.0-milestone18
  • Version 11.0.0-milestone19
  • Version 11.0.0-milestone20
  • Version 11.0.0-milestone21
  • Version 11.0.0-milestone22
  • Version 11.0.0-milestone23
  • Version 11.0.0-milestone24
  • Version 11.0.0-milestone25
  • Version 11.0.0-milestone26
  • From 11.0.1 before 11.0.15

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-24733
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-24733