Unscored severity · published Oct 20, 2026
CVE-2026-88041
Apache Tomcat: HTTP/2 trailer header cross-contamination
–
CVSS
0.2%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TO
Tomcat · Apache
11.0.0-M23 through 11.0.26; 10.1.27 through 10.1.60; 9.0.92 through 9.0.122 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-88041
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-88041
lists.apache.org
https://lists.apache.org/thread.html/dnmm9l3byytg3l66nk1jrqfrl7jty7n1
www.openwall.com
http://www.openwall.com/lists/oss-security/2026/10/20/24
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