Vulnerability DatabaseCVE-2026-101356
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CVE-2026-101356
Published:October 20, 2026
Updated:October 22, 2026
Incorrect object recycling and re-use vulnerability in Apache Tomcat affecting HTTP/2 processing of asynchronous servlets can trigger request and/or response mix-up between users. This issue affects Apache Tomcat: from 11.0.22 through 11.0.26, from 10.1.55 through 10.1.60, from 9.0.118 through 9.0.122. Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fixes the issue.
Affected Packages
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=11.0.22 <11.0.27
Fix Suggestion:
Update to version 11.0.27
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=10.1.55 <10.1.61
Fix Suggestion:
Update to version 10.1.61
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=9.0.118 <9.0.123
Fix Suggestion:
Update to version 9.0.123
org.apache.tomcat:tomcat-coyote (JAVA):
Affected version(s) >=9.0.118 <9.0.123
Fix Suggestion:
Update to version 9.0.123
org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=11.0.22 <11.0.27
Fix Suggestion:
Update to version 11.0.27
org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=10.1.55 <10.1.61
Fix Suggestion:
Update to version 10.1.61
org.apache.tomcat:tomcat-coyote (JAVA):
Affected version(s) >=11.0.22 <11.0.27
Fix Suggestion:
Update to version 11.0.27
org.apache.tomcat.experimental:tomcat-embed-programmatic (JAVA):
Affected version(s) >=9.0.118 <9.0.123
Fix Suggestion:
Update to version 9.0.123
org.apache.tomcat:tomcat-coyote (JAVA):
Affected version(s) >=10.1.55 <10.1.61
Fix Suggestion:
Update to version 10.1.61
org.apache.tomcat.experimental:tomcat-embed-programmatic (JAVA):
Affected version(s) >=10.1.55 <10.1.61
Fix Suggestion:
Update to version 10.1.61
org.apache.tomcat.experimental:tomcat-embed-programmatic (JAVA):
Affected version(s) >=11.0.22 <11.0.27
Fix Suggestion:
Update to version 11.0.27
org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=9.0.118 <9.0.123
Fix Suggestion:
Update to version 9.0.123
Related Resources (3)
https://lists.apache.org/thread.html/d1xjt7bbjqw7y7n5mcb4fm815hpfgc27
https://nvd.nist.gov/vuln/detail/CVE-2026-101356
http://www.openwall.com/lists/oss-security/2026/10/20/27
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CVSS v4
Base Score:
8.8
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
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-362
EPSS
Base Score:
0.52