{"action":"Upgrade org.apache.logging.log4j:log4j-1.2-api to 2.25.4 or later.","affected":[{"fixed":"2.25.4","introduced":"2.7"},{"introduced":"3.0.0-beta1","last_affected":"3.0.0-beta2"}],"component":"org.apache.logging.log4j:log4j-1.2-api","cve_ids":["CVE-2026-34479"],"ecosystem":"Maven","epss":0.00535,"exploited":false,"fixed_versions":["2.25.4"],"ghsa_id":"GHSA-h383-gmxw-35v2","id":"tcs_01M5N8ZFH5SY8C2ZQDWABKVRJE","modified_at":"2026-09-10T03:51:01.884178216Z","published_at":"2026-04-10T18:31:18Z","references":["https://osv.dev/vulnerability/GHSA-h383-gmxw-35v2","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"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-h383-gmxw-35v2","url":"https://osv.dev/vulnerability/GHSA-h383-gmxw-35v2"},{"source":"nvd","source_id":"CVE-2026-34479","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34479"}],"summary":"Apache Log4j 1 to Log4j 2 bridge: silent log event loss in Log4j1XmlLayout due to unescaped XML 1.0 forbidden characters"}