CVE-2026-59083 | BDVDB-2026-348485 Detail

ApacheApache Tomcat

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact none. Attack vector: network.

Weaknesses#

CWE-177 Improper Handling of URL Encoding (Hex Encoding)

References#

Exploit#

No public exploit known

History#

Version 12026-07-14Record published in the CVE List.

Published

Published: 2026-07-14
Last modified: 2026-07-14

Vendor information

Vendor: Apache
Product: Apache Tomcat

All Apache vulnerabilities

Score

9.1 Critical

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 44.6.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 11.0.0-M1 and <= 11.0.23
Fixed
Not stated
Vulnerable
>= 10.1.0-M1 and <= 10.1.56
Fixed
Not stated
Vulnerable
>= 9.0.0.M1 and <= 9.0.119
Fixed
Not stated
Vulnerable
>= 8.5.0 and <= 8.5.100
Fixed
Not stated
Vulnerable
Not stated
Fixed
0

Scoring System

CVSS v4.0

Not available

CVSS v3.1

9.1 Critical

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

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

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).