CVE-2026-65927— Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access control
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 中存在一个“差一错误”（Off-by-one Error）漏洞，该漏洞影响重写阀门（Rewrite Valves）中的 标志，导致重写处理从第二条规则重新开始，而不是从第一条规则开始。 此问题影响以下版本的 Apache Tomcat： 11.0.0-M1 至 11.0.24 10.1.0-M1 至 10.1.57 9.0.0-M1 至 9.0.120 在创建 CVE 时，以下版本已达到生命周期结束（EOL），但已知仍受影响： 8.5.0 至 8.5.100 其他不受支持的版本也可能受到
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1≤ 11.0.24 |
affected |
10.1.0-M1≤ 10.1.57 |
affected | ||
9.0.0.M1≤ 9.0.120 |
affected | ||
8.5.0≤ 8.5.100 |
affected | ||
7.0.0≤ 7.0.109 |
unaffected | ||
< 7.0.0 |
unaffected |
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I. Basic Information for CVE-2026-65927
Vulnerability Information
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Vulnerability Title
Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access control
Source: CVE Program / CVE List V5
Vulnerability Description
Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120.
The following versions were EOL at the time the CVE was created but are
known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected.
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
Off-by-one错误
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1 ~ 11.0.24 | - |
|
II. Public POCs for CVE-2026-65927
| # | POC Description | Source Link | Shenlong Link |
|---|
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Mailing List Discussions for CVE-2026-65927 (1)
Same Patch Batch · Apache Software Foundation · 2026-08-25 · 14 CVEs total
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| 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-2026-65637 | Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - CVE-2026-32990 fix in | |
| CVE-2026-65905 | Apache Tomcat: Limited replay attack possible with DIGEST authentication | |
| 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 |
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V. Comments for CVE-2026-65927
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