Not Failing Securely ('Failing Open') in Apache Tomcat - CVE-2026-74048
Published: October 20, 2026
Vulnerability identifier: #VU156277
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74048
CWE-ID: CWE-636
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to benefit from TLS operation outside the configured FIPS restrictions after FIPS activation fails.
The vulnerability exists due to failing open in Apache Tomcat OpenSSLLifecycleListener when FIPS activation fails despite being configured for FIPS mode. A local user can take advantage of continued startup using JSSE in non-FIPS mode to bypass the intended FIPS operating requirement.
Affected software
Apache Tomcat
How to mitigate CVE-2026-74048
Install security update from vendor's website.
Apache Tomcat - addressed in versions 9.0.123, 10.1.61, 11.0.27