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CVE-2026-65637— Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - CVE-2026-32990 fix incomplete

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Apache基金会的一个个Java Servlet容器。 Apache Tomcat 11.0.20版本至11.0.24版本、10.1.53版本至10.1.57版本和9.0.115版本至9.0.120版本存在输入验证错误漏洞，该漏洞源于输入验证不当，且对CVE-2026-32990的修复不完整。

AI Predicted 7.5 Difficulty: Easy EPSS 0.57% · P46

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
Apache Software Foundation Apache Tomcat 11.0.20≤ 11.0.24 affected
10.1.53≤ 10.1.57 affected
9.0.115≤ 9.0.120 affected
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I. Basic Information for CVE-2026-65637

Vulnerability Information
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Vulnerability Title
Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - CVE-2026-32990 fix incomplete
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990. This issue affects Apache Tomcat: from 11.0.20 through 11.0.24, from 10.1.53 through 10.1.57, from 9.0.115 through 9.0.120. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix 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Apache基金会的一个个Java Servlet容器。 Apache Tomcat 11.0.20版本至11.0.24版本、10.1.53版本至10.1.57版本和9.0.115版本至9.0.120版本存在输入验证错误漏洞，该漏洞源于输入验证不当，且对CVE-2026-32990的修复不完整。
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 11.0.20 ~ 11.0.24 -

II. Public POCs for CVE-2026-65637

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III. Intelligence Information for CVE-2026-65637

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Mailing List Discussions for CVE-2026-65637 (1)

Same Patch Batch · Apache Software Foundation · 2026-08-25 · 14 CVEs total

CVE-2026-49050 Apache DolphinScheduler: General user can mint admin access tokens via /access-tokens
CVE-2026-53561 Apache Hive: Unauthenticated authentication bypass in HiveServer2 HTTP SAML bearer-token v
CVE-2026-55976 Apache Hive: SSRF vulnerability in Hive Avro Serde due to Insufficient input validation on
CVE-2026-49845 Apache Hive: SQL Injection vulnerability in HiveMetaStore partition-name direct-SQL paths
CVE-2026-65182 Apache Tomcat: Bypass longest prefix security constraint
CVE-2026-65183 Apache Tomcat: TOCTOU when setting specific permissions for Unix Domain Sockets
CVE-2026-65905 Apache Tomcat: Limited replay attack possible with DIGEST authentication
CVE-2026-65927 Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access control
CVE-2026-66422 Apache Tomcat: Servlet role references can bypass declarative role constraints
CVE-2026-68525 Apache Tomcat: Redirect after FORM auth may bypass method specific constraints
CVE-2026-68569 Apache Tomcat: Principal lookup can fail open in some cases
CVE-2026-68763 Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset
CVE-2026-73180 Apache Tomcat: Authenticated WebSocket session survives end of HTTP session

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-65637

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