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Critical severity · published Jul 14, 2026
CVE-2026-59083
Apache Tomcat: Incorrect URL decoding in RewriteValve may allow security control bypass
9.1
CVSS
0.5%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TO
Tomcat · Apache
11.0.0-M1 through 11.0.23; 10.1.0-M1 through 10.1.56; 9.0.0.M1 through 9.0.119; 8.5.0 through 8.5.100 · source: vendor, NVD
Affected product
TO
Tomcat
Apache
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59083
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-59083
Mitigation
https://lists.apache.org/thread/3g63zos2gkjo5vgnrk8kxmosv47w6wbq
Mailing List
http://www.openwall.com/lists/oss-security/2026/07/14/7
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