Apache Tomcat: Incorrect URL decoding in RewriteValve may allow security control bypass

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Summary

CVECVE-2026-59083
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-14 09:16:41 UTC
Updated2026-07-14 16:57:31 UTC
DescriptionImproper 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.001560000 probability, percentile 0.051620000 (date 2026-07-14)

Problem Types: CWE-177 | CWE-177 CWE-177 Improper Handling of URL Encoding (Hex Encoding)

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Apache Tomcat All All All All
Application Apache Tomcat All All All All
Application Apache Tomcat All All All All
Application Apache Tomcat All All All All
Application Apache Tomcat All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Tomcat affected 11.0.0-M1 11.0.23 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 10.1.0-M1 10.1.56 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 9.0.0.M1 9.0.119 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 8.5.0 8.5.100 semver Not specified
CNA Apache Software Foundation Apache Tomcat unaffected 8.0.0 semver Not specified

References

ReferenceSourceLinkTags
lists.apache.org/thread/3g63zos2gkjo5vgnrk8kxmosv47w6wbq [email protected] lists.apache.org Mitigation, Vendor Advisory
www.openwall.com/lists/oss-security/2026/07/14/7 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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