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Vulnerability record · CVE-2026-86350 · published 23 September 2026

CVE-2026-86350: HTTP request smuggling vulnerability

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.

9.1 CVSS 3.1 Critical EPSS 0.31% · top 78.3% CWE-444 · HTTP request smuggling Awaiting Analysis
9.1CVSS 3.1 base score
0.31%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
23 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

LinkTags
https://lists.apache.org/thread/mss45z99lcdd5dtpgcn45dy82f3toswc

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Source: NIST National Vulnerability Database (record CVE-2026-86350), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.