Apache Software Foundation Apache Log4j Core
4 published vulnerabilities name this product.
As the CNAs write it in their CVE records (vendor and product); the versions are theirs.
| CVE | Vulnerable versions | Title | Severity | Published | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| CVE-2026-34480 | 2.0-alpha1 – < 2.25.4 ; 3.0.0-alpha1 – 3.0.0-beta3 | Apache Log4j Core: Silent log event loss in XmlLayout due to unescaped XML 1.0 forbidden characters | MEDIUM 6.9 | 1.0 % | ||
| CVE-2026-34478 | 2.21.0 – < 2.25.4 ; 3.0.0-beta1 – 3.0.0-beta3 | Apache Log4j Core: Log injection in Rfc5424Layout due to silent configuration incompatibility | MEDIUM 6.9 | 1.0 % | ||
| CVE-2026-34477 | 2.12.0 – < 2.25.4 ; 3.0.0-alpha1 – 3.0.0-beta3 | Apache Log4j Core: verifyHostName attribute silently ignored in TLS configuration, allowing hostname verification bypass | MEDIUM 6.3 | 0.6 % | ||
| CVE-2025-68161 | 2.0-beta9 – < 2.25.3 ; 3.0.0-alpha1 – 3.0.0-beta3 | Apache Log4j Core: Missing TLS hostname verification in Socket appender | MEDIUM 6.3 | 0.8 % |