CVE-2026-43513— Apache Tomcat: LockOutRealm treats user names as case-sensitive
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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 | ||
8.5.0≤ 8.5.100 | affected | ||
7.0.0≤ 7.0.109 | affected | ||
< 7.00 | unknown |
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I. Basic Information for CVE-2026-43513
Vulnerability Information
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Vulnerability Title
Apache Tomcat: LockOutRealm treats user names as case-sensitive
Source: NVD (National Vulnerability Database)
Vulnerability Description
Improper Handling of Case Sensitivity vulnerability in LockOutRealm 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 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Older unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
大小写敏感处理不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Apache Tomcat 安全漏洞
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至11.0.21版本、10.1.0-M1至10.1.54版本、9.0.0.M1至9.0.117版本、8.5.0至8.5.100版本和7.0.0至7.0.109版本存在安全漏洞，该漏洞源于LockOutRealm中大小写敏感性处理不当。
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-2026-43513
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2026-41293 | Apache Tomcat: HTTP/2 request headers not validated | |
| CVE-2026-43512 | Apache Tomcat: Digest authenticator will authenticate any unknown user | |
| 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
- CVE-2026-43515
Apache Tomcat: Security constraints not correctly applied - CVE-2026-43514
Apache Tomcat: AJP secret compared in non-constant time - CVE-2026-43512
Apache Tomcat: Digest authenticator will authenticate any un - CVE-2026-41293
Apache Tomcat: HTTP/2 request headers not validated - CVE-2026-42498
Apache Tomcat: WebSocket authentication header exposure
Same vendor: Apache Software Foundation
- CVE-2026-35194
Apache Flink: Remote code execution via SQL injection in cod - CVE-2026-45205
Apache Commons Configuration: StackOverflowError for YAML in - CVE-2026-43515
Apache Tomcat: Security constraints not correctly applied - CVE-2026-43514
Apache Tomcat: AJP secret compared in non-constant time - CVE-2026-43512
Apache Tomcat: Digest authenticator will authenticate any un
Same weakness: CWE-178
- CVE-2026-3833
Gnutls: gnutls: policy bypass due to case-sensitive namecons - CVE-2026-40453
Apache Camel JMS, Apache Camel CoAP, Apache Camel Google Pub - CVE-2026-22665
prompts.chat Identity Confusion via Case-Sensitive Username - CVE-2026-33691
OWASP CRS: Whitespace padding in filenames bypasses file upl - CVE-2026-3532
OpenID Connect / OAuth client - Less critical - Access bypas
V. Comments for CVE-2026-43513
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