Vulnerability in Apache Software Foundation Log4j Core
CVE-2026-34478
Apache Log4j Core's Rfc5424Layout https://logging.apache.org/log4j/2.x/manual/layouts.html#RFC5424Layout , in versions 2.21.0 through 2.25.3, is vulnerable to log injection via CRLF sequences due to undocumented renames of security-releva…
EPSS: 0.000 (10.5th percentile) — read the EPSS interpretation.
Affected products
- Apache Software Foundation Log4j Core — versions 2.21.0, 3.0.0-beta1
Weakness classification (CWE)
References
- github.com/apache/logging-log4j2/pull/4074 (patch)
- logging.apache.org/security.html (vendor-advisory)
- logging.apache.org/cyclonedx/vdr.xml (vendor-advisory)
- logging.apache.org/log4j/2.x/manual/layouts.html (related)
- lists.apache.org/thread/3k1clr2l6vkdnl4cbhjrnt1nyjvb5gwt (vendor-advisory)