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Apache Tomcat has an Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve

🗓️ 09 Apr 2026 21:31:30Reported by GitHub Advisory DatabaseType 
github
 github🔗 github.com👁 3 Views

Tomcat JsonAccessLogValve has an encoding bug; affected 9.0.40-9.0.116, 10.1.0-10.1.53, 11.0.0-11.0.20; upgrade to 9.0.117, 10.1.54, or 11.0.21.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: IBM Integration Bus for z/OS is vulnerable to multiple vulnerabilities due to Apache Tomcat
14 May 202614:09
–ibm
IBM Security Bulletins		Security Bulletin: Maximo AI Service uses multiple third party dependencies which are vulnerable to multiple CVEs.
27 May 202616:03
–ibm
ATTACKERKB		CVE-2026-34483
9 Apr 202619:30
–attackerkb
Tenable Nessus		Amazon Linux 2023 : tomcat9, tomcat9-admin-webapps, tomcat9-el-3.0-api (ALAS2023-2026-1672)
20 May 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : tomcat10, tomcat10-admin-webapps, tomcat10-el-5.0-api (ALAS2023-2026-1673)
20 May 202600:00
–nessus
Tenable Nessus		Amazon Linux 2 : tomcat, --advisory ALAS2TOMCAT9-2026-025 (ALASTOMCAT9-2026-025)
30 Apr 202600:00
–nessus
Tenable Nessus		Atlassian Confluence 8.9.0 < 9.2.20 / 9.3.1 < 10.2.11 (CONFSERVER-103708)
26 May 202600:00
–nessus
Tenable Nessus		Atlassian Jira Service Management Data Center and Server 10.0.1 < 10.3.20 / 10.4.0 < 11.3.5 (JSDSERVER-16587)
28 May 202600:00
–nessus
Tenable Nessus		openSUSE 16 Security Update : tomcat11 (openSUSE-SU-2026:20595-1)
23 Apr 202600:00
–nessus
Tenable Nessus		openSUSE 16 Security Update : tomcat (openSUSE-SU-2026:20611-1)
24 Apr 202600:00
–nessus
Rows per page
Vulners
Node
org.apache.tomcat.embedtomcat-embed-coreRange11.0.0-M1–11.0.21maven
OR
org.apache.tomcat.embedtomcat-embed-coreRange10.1.0-M1–10.1.54maven
OR
org.apache.tomcat.embedtomcat-embed-coreRange9.0.40–9.0.116maven
OR
org.apache.tomcattomcatRange11.0.0-M1–11.0.21maven
OR
org.apache.tomcattomcatRange10.1.0-M1–10.1.54maven
OR
org.apache.tomcattomcatRange9.0.40–9.0.116maven
OR
org.apache.tomcattomcat-catalinaRange11.0.0-M1–11.0.21maven
OR
org.apache.tomcattomcat-catalinaRange10.1.0-M1–10.1.54maven
OR
org.apache.tomcattomcat-catalinaRange9.0.40–9.0.116maven

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10 Apr 2026 21:38Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.17.5
EPSS0.00067
SSVC
CWE-116
tomcatjson log valvesecurity vulnerabilityversion rangesupgrade versions
3