What’s Vulnerable › Vulnerabilities
CVE-2026-86350: Apache Tomcat: Regression in fix for CVE-2026-41293 can trigger request header mix-up
- Severity: critical (CVSS 9.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-23 · updated 2026-09-23
- Weakness: CWE-444
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.
Affected products
- 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
References
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