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  4. CVE 2026 65927 apache tomcat rewritevalve n restarts at the
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Back to active CVEs
High · CVSS 7.5CVE-2026-65927

Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access controlCVE-2026-65927

Answer in brief

CVE-2026-65927 records a High severity (CVSS 7.5) vulnerability in Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access control. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/Apache Tomcat (generic), Apache Software Foundation/Apache Tomcat (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 25, 2026Updated Aug 27, 2026Source checked Oct 10, 2026First seen by HOL Aug 25, 2026Material review Aug 27, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/Apache Tomcat (generic), Apache Software Foundation/Apache Tomcat (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Apache Software Foundation/Apache Tomcatgeneric11.0.0-M1 || 10.1.0-M1 || 9.0.0.M1 || 8.5.0Not reported
Apache Software Foundation/Apache Tomcatgeneric>=11.0.0-M1 <=11.0.24 || >=10.1.0-M1 <=10.1.57 || >=9.0.0.M1 <=9.0.120 || >=8.5.0 <=8.5.100Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/Apache Tomcat, Apache Software Foundation/Apache Tomcat.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Aug 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 25, 2026

Sources and claim methodology

  • Source referencelists.apache.org
  • Source referenceopenwall.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-193
Source
CVE List V5
Source checked
Oct 10, 2026
References
2 linked sources
Open source record