CVE-2026-103119

Apache Tomcat: AJP response mix-up

Published Oct 20, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Description
Buffer under-read vulnerability in Apache Tomcat meant that a large non-blocking write could result in the response body being split between the current request and the next request received on that connection leading most likely to failure of the second request and possibly leakage of data from the first response to the second.



This issue affects Apache Tomcat: from 11.0.0-M25 through 11.0.26.



Users are recommended to upgrade to version 11.0.27, which fixes the issue.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Redhat
Redhat hummingbird
Weaknesses CWE-125
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics threat_severity

None

threat_severity

Moderate

Type Values Removed Values Added
First Time appeared Apache
Apache apache Tomcat
Apache tomcat
Apache Software Foundation
Apache Software Foundation tomcat
Vendors & Products Apache
Apache apache Tomcat
Apache tomcat
Apache Software Foundation
Apache Software Foundation tomcat
Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Buffer under-read vulnerability in Apache Tomcat meant that a large non-blocking write could result in the response body being split between the current request and the next request received on that connection leading most likely to failure of the second request and possibly leakage of data from the first response to the second. This issue affects Apache Tomcat: from 11.0.0-M25 through 11.0.26. Users are recommended to upgrade to version 11.0.27, which fixes the issue.
Title Apache Tomcat: AJP response mix-up
Weaknesses CWE-127
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Oct 20, 2026, 6:09 PM
Reserved
Sep 30, 2026, 6:39 AM
Status
Awaiting Analysis
Published
Oct 20, 2026, 2:16 PM
Modified
Oct 20, 2026, 7:35 PM
Severity
Moderate
Public date
Oct 20, 2026, 1:54 PM