๐Ÿ›ก๏ธ CVE-2026-34478
๐ŸŸ  CVSS 7.5 โ€” High โœ… No Known Exploit CWE-117 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE CWE-117
Public Exploit โœ… No
Source NVD
Published 2026-04-10
Updated 2026-06-15
Modified 2026-04-24

Affected Packages

Software From version Fixed in
log4j โ€” โ€”
org.apache.logging.log4j:log4j-core 3.0.0-beta1 โ€”

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