CVE-2026-49844

CVE-2026-49844 describes an issue in the Apache Log4j API where MapMessage.asJson() can emit non-finite IEEE 754 values (NaN, Infinity, -Infinity) as bare tokens during JSON serialization. This affects Log4j API versions 2.13.1–2.25.4 and 2.26.0. The fault occurs when a MapMessage contains an att...

CVE-2025-68161

CVE-2025-68161 affects Apache Log4j Core Socket Appender (versions 2.0-beta9–2.25.2). Root cause: TLS hostname verification is not performed for peer certificates when configured via verifyHostName or the log4j2.sslVerifyHostName setting. Impact: potential MITM interception/redirection of log tra...

CVE-2026-34477

CVE-2025-68161 (and CVE-2026-34477) affect Apache Log4j Core Socket Appender where TLS hostname verification was silently ignored when configured via verifyHostName, leaving potential MITM scenarios under SMTP, Socket, or Syslog Appenders using a nested element. The issue spans versions 2.0-beta...