Vulnerability Database

328,409

Total vulnerabilities in the database

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, 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, which fixes the issue.

CVSS v3:

  • Severity: Low
  • Score: 3.7
  • AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

CWEs:

Software From Fixed in
Maven icon org.apache.tomcat.embed / tomcat-embed-core 11.0.0-M1 11.0.15
Maven icon org.apache.tomcat.embed / tomcat-embed-core 10.1.0-M1 10.1.50
Maven icon org.apache.tomcat.embed / tomcat-embed-core - 9.0.113
Maven icon org.apache.tomcat / tomcat 11.0.0-M1 11.0.15
Maven icon org.apache.tomcat / tomcat 10.1.0-M1 10.1.50
Maven icon org.apache.tomcat / tomcat - 9.0.113
Maven icon org.apache.tomcat / tomcat-catalina 11.0.0-M1 11.0.15
Maven icon org.apache.tomcat / tomcat-catalina 10.1.0-M1 10.1.50
Maven icon org.apache.tomcat / tomcat-catalina - 9.0.113
apache / tomcat 9.0.1 9.0.113
apache / tomcat 10.1.1 10.1.50
apache / tomcat 11.0.1 11.0.15
apache / tomcat 9.0.0-milestone1 9.0.0-milestone1.x
apache / tomcat 9.0.0-milestone10 9.0.0-milestone10.x
apache / tomcat 9.0.0-milestone11 9.0.0-milestone11.x
apache / tomcat 9.0.0-milestone12 9.0.0-milestone12.x
apache / tomcat 9.0.0-milestone13 9.0.0-milestone13.x
apache / tomcat 9.0.0-milestone14 9.0.0-milestone14.x
apache / tomcat 9.0.0-milestone15 9.0.0-milestone15.x
apache / tomcat 9.0.0-milestone16 9.0.0-milestone16.x
apache / tomcat 9.0.0-milestone17 9.0.0-milestone17.x
apache / tomcat 9.0.0-milestone18 9.0.0-milestone18.x
apache / tomcat 9.0.0-milestone19 9.0.0-milestone19.x
apache / tomcat 9.0.0-milestone2 9.0.0-milestone2.x
apache / tomcat 9.0.0-milestone20 9.0.0-milestone20.x
apache / tomcat 9.0.0-milestone21 9.0.0-milestone21.x
apache / tomcat 9.0.0-milestone22 9.0.0-milestone22.x
apache / tomcat 9.0.0-milestone23 9.0.0-milestone23.x
apache / tomcat 9.0.0-milestone24 9.0.0-milestone24.x
apache / tomcat 9.0.0-milestone25 9.0.0-milestone25.x
apache / tomcat 9.0.0-milestone26 9.0.0-milestone26.x
apache / tomcat 9.0.0-milestone27 9.0.0-milestone27.x
apache / tomcat 9.0.0-milestone3 9.0.0-milestone3.x
apache / tomcat 9.0.0-milestone4 9.0.0-milestone4.x
apache / tomcat 9.0.0-milestone5 9.0.0-milestone5.x
apache / tomcat 9.0.0-milestone6 9.0.0-milestone6.x
apache / tomcat 9.0.0-milestone7 9.0.0-milestone7.x
apache / tomcat 9.0.0-milestone8 9.0.0-milestone8.x
apache / tomcat 9.0.0-milestone9 9.0.0-milestone9.x
apache / tomcat 10.0.0-milestone1 10.0.0-milestone1.x
apache / tomcat 10.0.0-milestone10 10.0.0-milestone10.x
apache / tomcat 10.0.0-milestone2 10.0.0-milestone2.x
apache / tomcat 10.0.0-milestone3 10.0.0-milestone3.x
apache / tomcat 10.0.0-milestone4 10.0.0-milestone4.x
apache / tomcat 10.0.0-milestone5 10.0.0-milestone5.x
apache / tomcat 10.0.0-milestone6 10.0.0-milestone6.x
apache / tomcat 10.0.0-milestone7 10.0.0-milestone7.x
apache / tomcat 10.0.0-milestone8 10.0.0-milestone8.x
apache / tomcat 10.0.0-milestone9 10.0.0-milestone9.x
apache / tomcat 11.0.0-milestone1 11.0.0-milestone1.x
apache / tomcat 11.0.0-milestone10 11.0.0-milestone10.x
apache / tomcat 11.0.0-milestone11 11.0.0-milestone11.x
apache / tomcat 11.0.0-milestone12 11.0.0-milestone12.x
apache / tomcat 11.0.0-milestone13 11.0.0-milestone13.x
apache / tomcat 11.0.0-milestone14 11.0.0-milestone14.x
apache / tomcat 11.0.0-milestone15 11.0.0-milestone15.x
apache / tomcat 11.0.0-milestone16 11.0.0-milestone16.x
apache / tomcat 11.0.0-milestone17 11.0.0-milestone17.x
apache / tomcat 11.0.0-milestone18 11.0.0-milestone18.x
apache / tomcat 11.0.0-milestone19 11.0.0-milestone19.x
apache / tomcat 11.0.0-milestone2 11.0.0-milestone2.x
apache / tomcat 11.0.0-milestone20 11.0.0-milestone20.x
apache / tomcat 11.0.0-milestone21 11.0.0-milestone21.x
apache / tomcat 11.0.0-milestone22 11.0.0-milestone22.x
apache / tomcat 11.0.0-milestone23 11.0.0-milestone23.x
apache / tomcat 11.0.0-milestone24 11.0.0-milestone24.x
apache / tomcat 11.0.0-milestone25 11.0.0-milestone25.x
apache / tomcat 11.0.0-milestone26 11.0.0-milestone26.x
apache / tomcat 11.0.0-milestone3 11.0.0-milestone3.x
apache / tomcat 11.0.0-milestone4 11.0.0-milestone4.x
apache / tomcat 11.0.0-milestone5 11.0.0-milestone5.x
apache / tomcat 11.0.0-milestone6 11.0.0-milestone6.x
apache / tomcat 11.0.0-milestone7 11.0.0-milestone7.x
apache / tomcat 11.0.0-milestone8 11.0.0-milestone8.x
apache / tomcat 11.0.0-milestone9 11.0.0-milestone9.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.