CVE-2026-103119 Security Details

CVE ID

CVE-2026-103119

CWE

CWE-127

CVE 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.

Published

Oct 22, 2026

CVSS Score & Severity

6.3Medium

CVSS Vector

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

EPSS Score

0.586%

Malware

malware

KEV Status

Not in KEV Catalog: No known exploits

Vulnerable Methods

org/apache/catalina/connector/OutputBuffer.updateBytesWritten(I)V

JVMVulnerable params: 0

Affected Ecosystems

affected

Source

National Vulnerability Database

References

openwall.comPROJECT

Red Hat · Security advisoryPROJECT

Apache · AnnouncementPROJECT