CVE-2026-78437 Security Details

CVE ID

CVE-2026-78437

CWE

CWE-459

CVE 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.

Published

Sep 24, 2026

CVSS Score & Severity

6.3Medium

CVSS Vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

EPSS Score

0.511%

Malware

malware

KEV Status

Not in KEV Catalog: No known exploits

Vulnerable Methods

org/apache/coyote/http2/StreamProcessor.validateRequest()Z

JVM

Affected Ecosystems

affected

Source

National Vulnerability Database

References

Apache · AnnouncementPROJECT