Vulnerability DatabaseCVE-2026-34483
Mend.io Vulnerability Database
The largest open source vulnerability database
What is a Vulnerability ID?
New vulnerability? Tell us about it!
CVE-2026-34483
Published:April 09, 2026
Updated:April 20, 2026
Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.40 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117 , which fix the issue.
Affected Packages
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=9.0.40 <9.0.117
Fix Suggestion:
Update to version 9.0.117
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=11.0.0-M1 <11.0.21
Fix Suggestion:
Update to version 11.0.21
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=10.1.0-M1 <10.1.54
Fix Suggestion:
Update to version 10.1.54
org.apache.tomcat:tomcat-catalina (JAVA):
Affected version(s) >=10.1.0-M1 <10.1.54
Fix Suggestion:
Update to version 10.1.54
org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=9.0.40 <9.0.117
Fix Suggestion:
Update to version 9.0.117
org.apache.tomcat:tomcat-catalina (JAVA):
Affected version(s) >=9.0.40 <9.0.116
Fix Suggestion:
Update to version 9.0.116
org.apache.tomcat:tomcat-catalina (JAVA):
Affected version(s) >=9.0.40 <9.0.117
Fix Suggestion:
Update to version 9.0.117
org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=10.1.0-M1 <10.1.54
Fix Suggestion:
Update to version 10.1.54
org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=9.0.40 <9.0.116
Fix Suggestion:
Update to version 9.0.116
org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=11.0.0-M1 <11.0.21
Fix Suggestion:
Update to version 11.0.21
org.apache.tomcat:tomcat-catalina (JAVA):
Affected version(s) >=11.0.0-M1 <11.0.21
Fix Suggestion:
Update to version 11.0.21
Related Resources (4)
https://lists.apache.org/thread/j1w7304yonlr8vo1tkb5nfs7od1y228b
http://www.openwall.com/lists/oss-security/2026/04/09/26
https://github.com/apache/tomcat
https://nvd.nist.gov/vuln/detail/CVE-2026-34483
Do you need more information?
Contact Us
CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Improper Encoding or Escaping of Output
CWE-116
EPSS
Base Score:
0.03