Uncontrolled Resource Consumption in Apache Tomcat Affecting Multiple Versions
CVE-2026-68763

7.5HIGH

Key Information:

Vendor

Apache
Status
Apache Tomcat
Vendor
CVE Published:
25 August 2026

What is CVE-2026-68763?

An uncontrolled resource consumption vulnerability has been discovered in Apache Tomcat, which is caused by an allocation leak in the HTTP/2 backlog tracking mechanism when a stream is reset. This may lead to resource exhaustion, impacting the performance and availability of the server. It is vital for users to upgrade to the fixed versions: 11.0.25, 10.1.58, or 9.0.121, to mitigate these risks and ensure the stability of their applications.

Affected Version(s)

Apache Tomcat 11.0.0-M1 <= 11.0.24

Apache Tomcat 10.1.0-M1 <= 10.1.57

Apache Tomcat 9.0.39 <= 9.0.120

References

https://lists.apache.org/thread/tv51ty39ppv41v04hdtkp9dp7...
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Zhen Kong
.