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CVE-2026-59083

Apache Tomcat vulnerability

9.1 CRITICALEPSS 0.37%
  1. Published14 Jul 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Apache Tomcat≥ 10.1.0 ≤ 10.1.56 · ≥ 11.0.0 ≤ 11.0.23 · ≥ 8.5.0 ≤ 8.5.100 · ≥ 9.0.0 ≤ 9.0.119

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2026-59083 being actively exploited?

CVE-2026-59083 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.37%.

How severe is CVE-2026-59083?

CVE-2026-59083 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.37% probability of exploitation.

Which products are affected by CVE-2026-59083?

Affected products include Apache Tomcat.

How do I fix CVE-2026-59083?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-59083 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.