CVE-2026-34478
HighCVSS 7.5Exploitation Probability (EPSS)
Elevated risk62th percentile - higher than 62% of all known CVEs
Summary
Apache Log4j Core w wersjach od 2.21.0 do 2.25.3 jest podatny na wstrzykiwanie logów za pomocą sekwencji CRLF z powodu nieudokumentowanych zmian nazw atrybutów konfiguracyjnych związanych z bezpieczeństwem. Dwie różne kwestie dotyczą użytkowników usług syslog opartych na strumieniach, którzy bezpośrednio konfigurowali Rfc5424Layout.
Risk Assessment
Organizacje mogą być narażone na wstrzykiwanie złośliwych danych do logów, co może prowadzić do poważnych problemów z bezpieczeństwem i integralnością danych. Użytkownicy korzystający z TCP i TLS mogą być szczególnie narażeni na te ataki.
Recommendation
Zaleca się aktualizację do Apache Log4j Core w wersji 2.25.4, która naprawia te problemy związane z bezpieczeństwem.
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Original NVD description (English source)
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-relevant configuration attributes. Two distinct issues affect users of stream-based syslog services who configure Rfc5424Layout directly: * 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. Users of the SyslogAppender are not affected, as its configuration attributes were not modified. Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

