MODERATEMaven →
Apache Log4j 1 to Log4j 2 bridge: silent log event loss in Log4j1XmlLayout due to unescaped XML 1.0 forbidden characters
Apache Log4j 1 to Log4j 2 bridge: silent log event loss in Log4j1XmlLayout due to unescaped XML 1.0 forbidden characters
Affected packages
- org.apache.logging.log4j:log4j-1.2-api— 2.7 → 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-2026-34479
- https://github.com/apache/logging-log4j2/pull/4078
- https://github.com/apache/logging-log4j2
- https://lists.apache.org/thread/gd0hp6mj17rn3kj279vgy4p7kd4zz5on
- https://logging.apache.org/cyclonedx/vdr.xml
- https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html
- https://logging.apache.org/security.html#CVE-2026-34479
- http://www.openwall.com/lists/oss-security/2026/04/10/8
Structured record: https://osv.dev/vulnerability/GHSA-h383-gmxw-35v2
Recommended response stack
Some links are affiliate links — HackTribune may earn a commission at no extra cost to you.
Get incidents like this as alerts for your stack.
Join the beta