Vulnerability DatabaseCVE-2026-78437
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CVE-2026-78437
Published:September 23, 2026
Updated:October 10, 2026
Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail. This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
Affected Packages
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=9.0.116 <9.0.122
Fix Suggestion:
Update to version 9.0.122
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=10.1.53 <10.1.60
Fix Suggestion:
Update to version 10.1.60
https://github.com/apache/tomcat.git (GITHUB):
Affected version(s) >=11.0.19 <11.0.26
Fix Suggestion:
Update to version 11.0.26
org.apache.tomcat:tomcat-coyote (JAVA):
Affected version(s) >=9.0.116 <9.0.122
Fix Suggestion:
Update to version 9.0.122
org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=9.0.116 <9.0.122
Fix Suggestion:
Update to version 9.0.122
org.apache.tomcat.experimental:tomcat-embed-programmatic (JAVA):
Affected version(s) >=11.0.20 <11.0.26
Fix Suggestion:
Update to version 11.0.26
org.apache.tomcat.experimental:tomcat-embed-programmatic (JAVA):
Affected version(s) >=9.0.116 <9.0.122
Fix Suggestion:
Update to version 9.0.122
org.apache.tomcat:tomcat-coyote (JAVA):
Affected version(s) >=11.0.20 <11.0.26
Fix Suggestion:
Update to version 11.0.26
org.apache.tomcat:tomcat-coyote (JAVA):
Affected version(s) >=10.1.53 <10.1.60
Fix Suggestion:
Update to version 10.1.60
org.apache.tomcat.experimental:tomcat-embed-programmatic (JAVA):
Affected version(s) >=10.1.53 <10.1.60
Fix Suggestion:
Update to version 10.1.60
org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=11.0.20 <11.0.26
Fix Suggestion:
Update to version 11.0.26
org.apache.tomcat.embed:tomcat-embed-core (JAVA):
Affected version(s) >=10.1.53 <10.1.60
Fix Suggestion:
Update to version 10.1.60
Related Resources (3)
https://nvd.nist.gov/vuln/detail/CVE-2026-78437
https://lists.apache.org/thread/qkmsos3s8chn5053qr466rzwv6sk5gjg
http://www.openwall.com/lists/oss-security/2026/09/23/26
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
Incomplete Cleanup
CWE-459
EPSS
Base Score:
0.26