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Vulnerabilities

Vulnerability · CVE-2026-24733

Improper Input Validation vulnerability in Apache Tomcat.

Published Feb 17, 2026 · catalog updated Jun 17, 2026 · Apache Software Foundation Apache Tomcat

Last checked Nov 13, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-24733. EPSS is 0.59%. Act only if a listed version of Apache Software Foundation Apache Tomcat is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.59%
Remediation
Version ranges on file
Affected products
cpe apache/tomcat · vendor Apache Software Foundation Apache Tomcat 11.0.0-M1 ≤11.0.14

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, from 10.1.0-M1 through 10.1.49, from 9.0.0.M1 through 9.0.112. Older, EOL versions are also affected. Users are recommended to upgrade to version 11.0.15 or later, 10.1.50 or later or 9.0.113 or later, w

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe apache/tomcat9.0.0
  • cpe apache/tomcat< 10.1.50
  • cpe apache/tomcat< 11.0.15
  • cpe apache/tomcat< 9.0.113
  • vendor Apache Software Foundation Apache Tomcat 11.0.0-M1 ≤11.0.1411.0.0-M1 ≤11.0.14

How to fix CVE-2026-24733

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-24733. EPSS is 0.59%. Act only if a listed version of Apache Software Foundation Apache Tomcat is installed.

Which versions are affected?

Compare what you have installed with Apache Software Foundation Apache Tomcat 11.0.0-M1 ≤11.0.14 11.0.0-M1 ≤11.0.14. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-20: Improper Input Validation. EPSS 0.59%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Apache Tomcat security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 17, 2026 · Monitored products — critical

    Detected

    CVE-2026-24733 is listed by Improper Input Validation vulnerability in Apache Tomcat..

  2. Jun 17, 2026 · Monitored products — critical

    Updated

    CVE-2026-24733 is listed by Improper Input Validation vulnerability in Apache Tomcat..

Sources

  • CVE.orgVulnerability recordCVE-2026-24733

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-24733

    30-day exploitation probability 0.59%

    first.org
  • EUVDVulnerability recordEUVD-2026-7831

    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 (s

    euvd.enisa.europa.eu
  • Monitored products — criticalVendor advisoryCVE-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, fro

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 13, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 13, 2026
  • EUVDNov 8, 2026
  • CVE.orgNov 4, 2026
  • Monitored products — criticalNov 3, 2026