Buffer under-read in Apache Tomcat - CVE-2026-103119
Published: October 20, 2026
Vulnerability identifier: #VU156278
CSH Severity: Medium
CVSS v4: 6.3 [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]
CVE-ID: CVE-2026-103119
CWE-ID: CWE-127
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to potentially obtain data from another response or cause a subsequent request to fail.
The vulnerability exists due to a buffer under-read in Apache Tomcat's AJP response processing when performing a large non-blocking write. A remote attacker can potentially receive part of a preceding response through a subsequent request on the same connection to disclose response data or cause a denial of service.
Affected software
Apache Tomcat
How to mitigate CVE-2026-103119
Install security update from vendor's website.
Apache Tomcat - update to 11.0.27