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Apache Log4j Core: Silent log event loss in XmlLayout due to unescaped XML 1.0 forbidden characters

Apache Log4j Core: Silent log event loss in XmlLayout due to unescaped XML 1.0 forbidden characters

CVE-2026-34480Published 5 months agoUpdated 5 days agoSource: OSV

Affected packages

  • org.apache.logging.log4j:log4j-core— 2.0-alpha1 → 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

Structured record: https://osv.dev/vulnerability/GHSA-3pxv-7cmr-fjr4

Recommended response stack

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Apache Log4j Core: Silent log event loss in XmlLayout due to unescaped XML 1.0 forbidden characters | HackTribune