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Vulnerability record · CVE-2026-78437 · published 23 September 2026

CVE-2026-78437: Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing…

Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail. This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 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.

7.3 CVSS 3.1 High EPSS 0.26% · top 84.1% CWE-459 · CWE-459 Awaiting Analysis
7.3CVSS 3.1 base score
0.26%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
23 Sep 2026Last modified by NVD

Description

Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail. This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 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:L/I:L/A:L

References

LinkTags
https://lists.apache.org/thread/qkmsos3s8chn5053qr466rzwv6sk5gjg
http://www.openwall.com/lists/oss-security/2026/09/23/26

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Source: NIST National Vulnerability Database (record CVE-2026-78437), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.