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CVE-2026-41293— Apache Tomcat: HTTP/2 request headers not validated

Quick assessment

Affected
Apache Software Foundation Apache Tomcat
Exploitation
Public or AI PoC available; prioritize validation
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 11.0.0-M1版本至11.0.21版本、10.1.0-M1版本至10.1.54版本、9.0.0.M1版本至9.0.117版本和10.0.0-M1版本至10.0.27版本存在输入验证错误漏洞，该漏洞源于输入验证不当。

AI Predicted 5.3 Difficulty: Easy EPSS 1.68% · P76

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 5

VendorProduct Version RangeStatus
Apache Software Foundation Apache Tomcat 11.0.0-M1≤ 11.0.21 affected
10.1.0-M1≤ 10.1.54 affected
9.0.0.M1≤ 9.0.117 affected
10.0.0-M1≤ 10.0.27 affected
8.5.0≤ 8.5.100 affected
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I. Basic Information for CVE-2026-41293

Vulnerability Information
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Vulnerability Title
Apache Tomcat: HTTP/2 request headers not validated
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Input Validation vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 10.0.0-M1 through 10.0.27. Older, end of support versions may also be affected. Users are recommended to upgrade to version [FIXED_VERSION], 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 11.0.0-M1版本至11.0.21版本、10.1.0-M1版本至10.1.54版本、9.0.0.M1版本至9.0.117版本和10.0.0-M1版本至10.0.27版本存在输入验证错误漏洞，该漏洞源于输入验证不当。
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 ~ 11.0.21 -

II. Public POCs for CVE-2026-41293

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
default-local-qwen3.6 · 12011 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-41293

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Mailing List Discussions for CVE-2026-41293 (1)

Same Patch Batch · Apache Software Foundation · 2026-05-12 · 7 CVEs total

CVE-2026-41284 Apache Tomcat: Unbounded read in WebDAV LOCK and PROPFIND handling
CVE-2026-42498 Apache Tomcat: WebSocket authentication header exposure
CVE-2026-43512 Apache Tomcat: Digest authenticator will authenticate any unknown user
CVE-2026-43513 Apache Tomcat: LockOutRealm treats user names as case-sensitive
CVE-2026-43514 Apache Tomcat: AJP secret compared in non-constant time
CVE-2026-43515 Apache Tomcat: Security constraints not correctly applied

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-41293

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