GHSA-W35J-PV5H-Q9Q9 Apache Log4j JSON Template Layout: Improper serialization of non-finite floating-point values in JsonTemplateLayout

Apache Log4j's JsonTemplateLayout, in versions up to and including 2.25.3, produces invalid JSON output when log events contain non-finite floating-point values NaN, Infinity, or -Infinity, which are prohibited by RFC 8259. This may cause downstream log processing systems to reject or fail to ind...

Apache Log4j JSON Template Layout: Improper serialization of non-finite floating-point values in JsonTemplateLayout

Apache Log4j's JsonTemplateLayout, in versions up to and including 2.25.3, produces invalid JSON output when log events contain non-finite floating-point values NaN, Infinity, or -Infinity, which are prohibited by RFC 8259. This may cause downstream log processing systems to reject or fail to ind...

GHSA-H383-GMXW-35V2 Apache Log4j 1 to Log4j 2 bridge: silent log event loss in Log4j1XmlLayout due to unescaped XML 1.0 forbidden characters

The Log4j1XmlLayout from the Apache Log4j 1-to-Log4j 2 bridge fails to escape characters forbidden by the XML 1.0 standard, producing malformed XML output. Conforming XML parsers are required to reject documents containing such characters with a fatal error, which may cause downstream log...

EUVD-2026-21412

Apache Log4j's JsonTemplateLayout https://logging.apache.org/log4j/2.x/manual/json-template-layout.html , in versions up to and including 2.25.3, produces invalid JSON output when log events contain non-finite floating-point values NaN, Infinity, or -Infinity, which are prohibited by RFC 8259. Th...

EUVD-2026-21409

The Log4j1XmlLayout from the Apache Log4j 1-to-Log4j 2 bridge fails to escape characters forbidden by the XML 1.0 standard, producing malformed XML output. Conforming XML parsers are required to reject documents containing such characters with a fatal error, which may cause downstream log...

EUVD-2026-21408

Apache Log4j Core's Rfc5424Layout https://logging.apache.org/log4j/2.x/manual/layouts.htmlRFC5424Layout , in versions 2.21.0 through 2.25.3, is vulnerable to log injection via CRLF sequences due to undocumented renames of security-relevant configuration attributes. Two distinct issues affect user...

GHSA-3PXV-7CMR-FJR4 Apache Log4j Core: Silent log event loss in XmlLayout due to unescaped XML 1.0 forbidden characters

Apache Log4j Core's XmlLayout, in versions up to and including 2.25.3, fails to sanitize characters forbidden by the XML 1.0 specification, producing invalid XML output whenever a log message or MDC value contains such characters. The impact depends on the StAX implementation in use: JRE built-in...

GHSA-445C-VH5M-36RJ Apache Log4j Core: log injection in `Rfc5424Layout` due to silent configuration incompatibility

Apache Log4j Core's Rfc5424Layout, in versions 2.21.0 through 2.25.3, is vulnerable to log injection via CRLF sequences due to undocumented renames of security-relevant configuration attributes. Two distinct issues affect users of stream-based syslog services who configure Rfc5424Layout directly:...

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

Apache Log4j Core's XmlLayout, in versions up to and including 2.25.3, fails to sanitize characters forbidden by the XML 1.0 specification, producing invalid XML output whenever a log message or MDC value contains such characters. The impact depends on the StAX implementation in use: JRE built-in...

GHSA-6HG6-V5C8-FPHQ Apache Log4j Core: `verifyHostName` attribute silently ignored in TLS configuration

The fix for CVE-2025-68161 was incomplete: it addressed hostname verification only when enabled via the log4j2.sslVerifyHostName system property, but not when configured through the verifyHostName attribute of the element. Although the verifyHostName configuration attribute was introduced in Log4...

EUVD-2026-21410

Apache Log4j Core's XmlLayout https://logging.apache.org/log4j/2.x/manual/layouts.htmlXmlLayout , in versions up to and including 2.25.3, fails to sanitize characters forbidden by the XML 1.0 specification https://www.w3.org/TR/xml/charsets producing invalid XML output whenever a log message or M...

EUVD-2026-21407

The fix for CVE-2025-68161 https://logging.apache.org/security.htmlCVE-2025-68161 was incomplete: it addressed hostname verification only when enabled via the log4j2.sslVerifyHostName https://logging.apache.org/log4j/2.x/manual/systemproperties.htmllog4j2.sslVerifyHostName system property, but no...

Apache Log4j Core: `verifyHostName` attribute silently ignored in TLS configuration

The fix for CVE-2025-68161 was incomplete: it addressed hostname verification only when enabled via the log4j2.sslVerifyHostName system property, but not when configured through the verifyHostName attribute of the element. Although the verifyHostName configuration attribute was introduced in Log4...

africa.shuwari.sbt:sbt-js_2.12_1.0 (>=0.14.1, <=0.16.1), africa.shuwari.sbt:sbt-netbeans_2.12_1.0 (>=0.1.0, <=0.1.1) +25380 more potentially affected by CVE-2026-34479 via org.apache.logging.log4j:log4j-core (>=2.0, <=3.0.0-beta3)

org.apache.logging.log4j:log4j-core MAVEN version =2.0, =0.14.1, =0.1.0, =0.9.6, =0.12.0, =0.9.6, =0.9.6, =0.9.6, =0.9.6, =0.14.1, =0.9.6, =0.14.1, =4.4.0.0, =1.4.6, =1.4.6, =1.4.9 and more Source cves: CVE-2026-34479 Source advisory: SNYK:JAVA-ORGAPACHELOGGINGLOG4J-15967804...

Improper Validation of Certificate with Host Mismatch

Overview org.apache.logging.log4j:log4j-core is a logging library for Java. Affected versions of this package are vulnerable to Improper Validation of Certificate with Host Mismatch due to the lack of TLS hostname verification in the SocketAppender component when configured through the...

africa.shuwari.sbt:sbt-js_2.12_1.0 (>=0.14.1, <=0.16.1), africa.shuwari.sbt:sbt-netbeans_2.12_1.0 (>=0.1.0, <=0.1.1) +25380 more potentially affected by CVE-2026-34477 via org.apache.logging.log4j:log4j-core (>=2.0, <=3.0.0-beta3)

org.apache.logging.log4j:log4j-core MAVEN version =2.0, =0.14.1, =0.1.0, =0.9.6, =0.12.0, =0.9.6, =0.9.6, =0.9.6, =0.9.6, =0.14.1, =0.9.6, =0.14.1, =4.4.0.0, =1.4.6, =1.4.6, =1.4.9 and more Source cves: CVE-2026-34477 Source advisory: SNYK:JAVA-ORGAPACHELOGGINGLOG4J-15967727...

ai.catboost:catboost-spark_4.0_2.13 (1.2.10), ai.catboost:catboost-spark_4.1_2.13 (1.2.10) +1106 more potentially affected by CVE-2026-34481 via org.apache.logging.log4j:log4j-layout-template-json (>=2.14.0, <=3.0.0-beta3)

org.apache.logging.log4j:log4j-layout-template-json MAVEN version =2.14.0, =2.6.0-looktech.1, =2.6.0-looktech.1, =2.6.0-looktech.1, =2.6.0-looktech.1, =2.6.0-looktech.1, =2.6.0-looktech.1, =2.6.0-looktech.1, =4.9.0, =4.9.0, =4.9.0, =4.9.0, =4.9.2 and more Source cves: CVE-2026-34481 Source...

africa.shuwari.sbt:sbt-js_2.12_1.0 (>=0.14.1, <=0.16.1), africa.shuwari.sbt:sbt-netbeans_2.12_1.0 (>=0.1.0, <=0.1.1) +25380 more potentially affected by CVE-2026-34478 via org.apache.logging.log4j:log4j-core (>=2.0, <=3.0.0-beta3)

org.apache.logging.log4j:log4j-core MAVEN version =2.0, =0.14.1, =0.1.0, =0.9.6, =0.12.0, =0.9.6, =0.9.6, =0.9.6, =0.9.6, =0.14.1, =0.9.6, =0.14.1, =4.4.0.0, =1.4.6, =1.4.6, =1.4.9 and more Source cves: CVE-2026-34478 Source advisory: SNYK:JAVA-ORGAPACHELOGGINGLOG4J-15967739...

Improper Output Neutralization for Logs

Overview org.apache.logging.log4j:log4j-core is a logging library for Java. Affected versions of this package are vulnerable to Improper Output Neutralization for Logs in the Rfc5424Layout plugin due to newLineEscape and useTlsMessageFormat configuration attributes being silently renamed, leading...

Improper Encoding or Escaping of Output

Overview org.apache.logging.log4j:log4j-core is a logging library for Java. Affected versions of this package are vulnerable to Improper Encoding or Escaping of Output in the XmlLayout plugin. An attacker can cause log events to be silently lost or malformed by injecting XML 1.0 forbidden...