Is org.apache.logging.log4j:log4j-core affected by CVE-2026-34478?

Maven org.apache.logging.log4j:log4j-core is affected in >=2.21.0 =3.0.0-beta1 <=3.0.0-beta3.

Is CVE-2026-34478 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.8%.

medium

CVE-2026-34478

Q: Is CVE-2026-34478 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.8%.

Maven · org.apache.logging.log4j:log4j-core

Summary

Apache Log4j Core: log injection in `Rfc5424Layout` due to silent configuration incompatibility

Severity: medium
EPSS: 0.8% (p53)
Also known as: GHSA-445c-vh5m-36rj
Published: 2026-04-10

References

Related advisories

CVE-2021-45046 — critical · Maven/org.apache.logging.log4j:log4j-core
CVE-2021-44228 — critical · Maven/org.apache.logging.log4j:log4j-core
CVE-2026-34480 — medium · Maven/org.apache.logging.log4j:log4j-core
CVE-2026-34477 — medium · Maven/org.apache.logging.log4j:log4j-core
CVE-2025-68161 — medium · Maven/org.apache.logging.log4j:log4j-core

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.