AIKIDO-2026-915093
tomcat-embed-core is vulnerable to Denial of Service
75
High Risk
This Affects:
tomcat-embed-coreTL;DR
tomcat-embed-core leaks allocations in HTTP/2 backlog tracking when a stream is reset. A remote client can reset streams to consume tracking resources. Repeated resets can exhaust the server and deny service. The fix releases backlog tracking state when a stream is reset.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and HTTP/2 is enabled.
Background info
tomcat-embed-core is vulnerable to Denial of Service in versions 8.5.59 - 9.0.120, 10.1.0 - 10.1.57 and 11.0.0 - 11.0.24.
How to fix this
Upgrade the org.apache.tomcat.embed:tomcat-embed-core library to the patch version.
Links
tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.25lists.apache.org/thread/tv51ty39ppv41v04hdtkp9dp7tg02nzlopenwall.com/lists/oss-security/2026/08/26/9
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