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Apache Log4j Core: log injection in `Rfc5424Layout` due to silent configuration incompatibility
Apache Log4j Core: log injection in `Rfc5424Layout` due to silent configuration incompatibility
Affected packages
- org.apache.logging.log4j:log4j-core— 2.21.0 → 2.25.4
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://nvd.nist.gov/vuln/detail/CVE-2026-34478
- https://github.com/apache/logging-log4j2/pull/4074
- https://github.com/apache/logging-log4j2
- https://lists.apache.org/thread/3k1clr2l6vkdnl4cbhjrnt1nyjvb5gwt
- https://logging.apache.org/cyclonedx/vdr.xml
- https://logging.apache.org/log4j/2.x/manual/layouts.html#RFC5424Layout
- https://logging.apache.org/security.html#CVE-2026-34478
- http://www.openwall.com/lists/oss-security/2026/04/10/7
Structured record: https://osv.dev/vulnerability/GHSA-445c-vh5m-36rj
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