CVE-2026-88041: Apache Tomcat: HTTP/2 trailer header cross-contamination

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-20 · updated 2026-10-29
Weakness: CWE-459

Description

Incomplete cleanup vulnerability in Apache Tomcat allowed an trailer information from a previous request to leak into a subsequent request. This issue affects Apache Tomcat: from 11.0.0-M23 through 11.0.26, from 10.1.27 through 10.1.60, from 9.0.92 through 9.0.122. Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fix the issue.

Affected products

Apache Tomcat: from 11.0.0-M23 through 11.0.26; from 10.1.27 through 10.1.60; from 9.0.92 through 9.0.122

References

https://lists.apache.org/thread.html/dnmm9l3byytg3l66nk1jrqfrl7jty7n1
http://www.openwall.com/lists/oss-security/2026/10/20/24

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