Most recent entries from all https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Wed, 30 Sep 2026 07:59:12 +0000 CVE-2026-34478 — Apache Log4j Core: Log injection in Rfc5424Layout due to silent configuration incompatibility https://vulnerability.circl.lu/vuln/cve-2026-34478 <p><strong>Affected:</strong> Apache Software Foundation Apache Log4j Core</p> <p>Apache Log4j Core&#39;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-relevant configuration attributes.</p> <p>Two distinct issues affect users of stream-based syslog services who configure Rfc5424Layout directly:</p> <p>* The newLineEscape attribute was silently renamed, causing newline escaping to stop working for users of TCP framing (RFC 6587), exposing them to CRLF injection in log output. * The useTlsMessageFormat attribute was silently renamed, causing users of TLS framing (RFC 5425) to be silently downgraded to unframed TCP (RFC 6587), without newline escaping.</p> <p>Users of the SyslogAppender are not affected, as its configuration attributes were not modified.</p> <p>Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue.</p> <p><strong>Affected:</strong> Apache Software Foundation Apache Log4j Core</p> <p>Apache Log4j Core&#39;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-relevant configuration attributes.</p> <p>Two distinct issues affect users of stream-based syslog services who configure Rfc5424Layout directly:</p> <p>* The newLineEscape attribute was silently renamed, causing newline escaping to stop working for users of TCP framing (RFC 6587), exposing them to CRLF injection in log output. * The useTlsMessageFormat attribute was silently renamed, causing users of TLS framing (RFC 5425) to be silently downgraded to unframed TCP (RFC 6587), without newline escaping.</p> <p>Users of the SyslogAppender are not affected, as its configuration attributes were not modified.</p> <p>Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue.</p> https://vulnerability.circl.lu/vuln/cve-2026-34478