[ CVE-2026-86350 · Published 23 Sep 2026 ]
Vulnerability in Apache Software Foundation Apache Tomcat
[ Why it matters ]Priority signals
- Critical severity: CVSS 9.1
[ Description ]Official description
Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat caused by a regression in fix for CVE-2026-41293 can trigger request header mix-up. This issue affects Apache Tomcat: from 11.0.22 through 11.0.25, from 10.1.55 through 10.1.59, from 9.0.118 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.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ Advisories ]Government CERT advisories
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CERT-FRCERTFR-2026-AVI-1336
Multiple vulnerabilities in IBM products Translated from French
Multiple vulnerabilities have been discovered in IBM products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.
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CERT-FRCERTFR-2026-AVI-1218
Multiple vulnerabilities in Apache Tomcat Translated from French
Multiple vulnerabilities have been discovered in Apache Tomcat. Some of them allow an attacker to cause remote denial of service, a breach of data integrity and a security policy bypass.