CVE-2026-65927
Received
Received - Intake
Off-by-one Error in Apache Tomcat Rewrite Valve
Vulnerability report for CVE-2026-65927, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-08-25
Last updated on: 2026-08-25
Assigner: Apache Software Foundation
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| apache | tomcat | From 11.0.0-M1 (inc) to 11.0.24 (inc) |
| apache | tomcat | From 10.1.0-M1 (inc) to 10.1.57 (inc) |
| apache | tomcat | From 9.0.0.M1 (inc) to 9.0.120 (inc) |
| apache | tomcat | From 8.5.0 (inc) to 8.5.100 (inc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-193 | A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value. |
