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CVE-2026-24733— Apache Tomcat: Security constraint bypass with HTTP/0.9

Quick assessment

Affected
Apache Software Foundation Apache Tomcat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Tomcat是美国阿帕奇（Apache）基金会的一款轻量级Web应用服务器。用于实现对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat 11.0.14及之前版本、10.1.49及之前版本和9.0.112及之前版本存在输入验证错误漏洞，该漏洞源于未限制HTTP/0.9请求为GET方法，可能导致绕过针对GET请求的安全约束。

AI Predicted 6.5 Difficulty: Easy EPSS 0.51% · P42

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-24733

Vulnerability Information
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Vulnerability Title
Apache Tomcat: Security constraint bypass with HTTP/0.9
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Tomcat 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Tomcat是美国阿帕奇（Apache）基金会的一款轻量级Web应用服务器。用于实现对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat 11.0.14及之前版本、10.1.49及之前版本和9.0.112及之前版本存在输入验证错误漏洞，该漏洞源于未限制HTTP/0.9请求为GET方法，可能导致绕过针对GET请求的安全约束。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Tomcat 11.0.0-M1 ~ 11.0.14 -

II. Public POCs for CVE-2026-24733

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III. Intelligence Information for CVE-2026-24733

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Mailing List Discussions for CVE-2026-24733 (1)

Same Patch Batch · Apache Software Foundation · 2026-02-17 · 5 CVEs total

CVE-2026-24734 Apache Tomcat Native, Apache Tomcat: OCSP revocation bypass
CVE-2025-66614 Apache Tomcat: Client certificate verification bypass due to virtual host mapping
CVE-2026-25087 Apache Arrow: Potential use-after-free when reading IPC file with pre-buffering
CVE-2026-25903 Apache NiFi: Missing Authorization of Restricted Permissions for Component Updates

IV. Related Vulnerabilities

Same product: Apache Tomcat
Same vendor: Apache Software Foundation
Same weakness: CWE-20

V. Comments for CVE-2026-24733

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