CVE-2026-59083
Last modified
CVE-2026-59083 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through 9.0.119, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.. EPSS estimates a 0.16% chance of exploitation in the next 30 days.
Description
Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through 9.0.119, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apache | Tomcat | <= 8.0.0 |
| Apache | Tomcat | >= 8.5.0, <= 8.5.100 |
| Apache | Tomcat | >= 9.0.0, <= 9.0.119 |
| Apache | Tomcat | >= 10.1.0, <= 10.1.56 |
| Apache | Tomcat | >= 11.0.0, <= 11.0.23 |
References
- https://lists.apache.org/thread/3g63zos2gkjo5vgnrk8kxmosv47w6wbqMitigation, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/07/14/7Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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