2026-07-23 Release of logback version 1.6.0

• Removed certain deprecated variables, methods, and classes. For the list of removed members see release_1.6.0.txt.

• In AsyncAppenderBase, the put(ILoggingEvent) method now has the protected modifier to allow access from derived classes. This change was requested by Thomas Skjølberg in pr#1053.

• Bump SLF4J dependency to version 2.0.18.

• See also the overview of the 1.6.x series.

• A bit-wise identical binary of this version can be reproduced by building from source code at commit b07adf36019b51a10f824fdd94009985c587b1d3 associated with the tag v_1.6.0. The release was built using Java "21" 2023-10-17 LTS build 21.0.1.+12-LTS-29 under Linux Debian 11.6.

2026-07-09 Release of logback version 1.5.38

• In HardenedObjectInputStream, fixed a typo preventing Throwable objects from being white-filtered. This issue was reported in PR #1045 by t0rchwo0d.

• A bitwise identical binary of this version can be reproduced by building from source code at commit d04984a41fce42977466f45a2f076f0ee5cc4207 associated with the tag v_1.5.38. Release built using Java "21" 2023-10-17 LTS build 21.0.1.+12-LTS-29 under Linux Debian 11.6.

2026-06-26 Release of logback version 1.5.37

• Given the numerous vulnerabilities related to conditional configuration processing based on the evaluation of Java expressions using the Janino library, support for such expressions has been removed. Users are offered the an online migration service or the element introduced in version 1.5.20. See the relevant documentation for more details.

• A bitwise identical binary of this version can be reproduced by building from source code at commit c1df7f522e648eec7b4ef6a12c8758fec0f00048 associated with the tag v_1.5.37. Release built using Java "21" 2023-10-17 LTS build 21.0.1.+12-LTS-29 under Linux Debian 11.6.

2026-06-25 Release of logback version 1.5.36

• The 'condition' attribute in <if> elements now reject certain references that are associated with ACE attacks. This issue was reported by "yulate" (yulate531@gmail.com.com) and registered as CVE-2026-13006.

• A bitwise identical binary of this version can be reproduced by building from source code at commit 9b94c37562bf25a6a944146701d42ee6c4eee888 associated with the tag v_1.5.36. Release built using Java "21" 2023-10-17 LTS build 21.0.1.+12-LTS-29 under Linux Debian 11.6.

026-06-23 Release of logback version 1.5.35

• The 'condition' attribute in <if> elements now rejects unicode escape sequences (\u and \U). This closes a bypass of the existing prohibition on the new operator in Janino-evaluated conditions. This issue was reported by IcySun (icysun@qq.com) and registered as CVE-2026-13006.

• Added ConfiguratorRank.AUTHENTICATING (rank 100), the highest configurator rank, for certified/authenticating configurators discovered via the ServiceLoader mechanism. ContextInitializer now requires that at most one such configurator exist on the classpath; if more than one is found, initialization aborts with an error.

• ConsoleCharsetPropertyDefiner is no longer shipped. The Java 21 multi-release compilation of logback-core has been disabled, which removes this class from the published artifact. Configurations that referenced ch.qos.logback.core.property.ConsoleCharsetPropertyDefiner will need an alternative approach for console charset detection.

• The logback-examples module is now included in artifacts published to Maven Central.

• JoranConfigurator.makeAnotherInstance() and DefaultJoranConfigurator.performMultiStepConfigurationFileSearch() are now protected, allowing derived configurators to override these methods.

• A bitwise identical binary of this version can be reproduced by building from source code at commit 08bd1598d565d83444f72983935e7da4746783b7 associated with the tag v_1.5.35. Release built using Java "21" 2023-10-17 LTS build 21.0.1.+12-LTS-29 under Linux Debian 11.6.

2026-06-01 Release of logback version 1.5.34

• In case certain StackTraceElement values returned by the Throwable.getStackTrace method are null, StackTraceElementProxy substitutes a dummy instance instead of throwing an IllegalArgumentException. This resolves issues #1040, reported by Naotsugu Kobayashi.

• HardenedObjectInputStream will now throw an InvalidClassException during deserialization attempts of Proxy classes. This change addresses potential deserialization whitelist bypass vulnerability reported by York Shen and registered as CVE-2026-10532.

• A bitwise identical binary of this version can be reproduced by building from source code at commit e62272ac152469aec1ede056c3c7d0d7314e7bfe associated with the tag v_1.5.34. This release was built using Java "21" 2023-10-17 LTS build 21.0.1.+12-LTS-29 under Linux Debian 11.6.

2026-05-27 Release of logback version 1.5.33

• PropertiesConfiguratorModelHandler now registers properties file URLs to the ConfigurationWatchList when scan is enabled (via local scan="true" attribute or top-level configuration scan), ensuring changes are detected and reconfiguration occurs. This problem was reported in issues/1034.

• When processing <conversionRule> elements and both class and converterClass attributes are specified, silently use the class attribute without issuing a warning. However, if the attribute values differ, a warning will be issued. This change was requested in issues/1031.

• HardenedModelInputStream will no longer accept to deserialize all classes located under the "java.lang" and "java.util" packages but a limited number of explicitly authorized classes in those packages. This potential deserialization whitelist bypass vulnerability was reported by York Shen and registered as CVE-2026-9828.

• SSL parameters for SSLSocketAppender now enable hostname verification by default. Moreover, the default protocol is now "TLSv1.2". This potential vulnerability was reported by York Shen.

• When printing the status message field, ViewStatusMessagesServletBase now escapes special characters such as "&" as character entities. This potential vulnerability was reported by York Shen.

• A bit-wise identical binary of this version can be reproduced by building from source code at commit 124e8b49b55ac34d08743a0646bd463410192647 associated with the tag v_1.5.33. Release built using Java "21" 2023-10-17 LTS build 21.0.1.+12-LTS-29 under Linux Debian 11.6.

2026-02-16 Release of logback version 1.5.32

• In DefaultProcessor, fixed incorrect check for dependencies contained within a parent model. Previous only the direct children were scanned. This fixes logback-access/issues/34.

• A bit-wise identical binary of this version can be reproduced by building from source code at commit e807335a67535b4eacce94e942c0bcb649665d93 associated with the tag v_1.5.32. Release built using Java "21" 2023-10-17 LTS build 21.0.1.+12-LTS-29 under Linux Debian 11.6.

2026-02-14 Release of logback version 1.5.31

• Fixed missing META-INF/services directory in logback-classic.jar. This issue rendered logback-classic version 1.5.30 unusable with SLF4J.

• A bit-wise identical binary of this version can be reproduced by building from source code at commit 168e42f9f9a18a3ffdf31eb2bfe80a71e33ecd8b associated with the tag v_1.5.31. Release built using Java "21" 2023-10-17 LTS build 21.0.1.+12-LTS-29 under Linux Debian 11.6.

2026-02-14 Release of logback version 1.5.30

• Fix scanning issue when an included file becomes available at a later time. This problem was reported in issues/1021 by Sergey Nazarov.

• Standardized code for version checking across modules.

• A bit-wise identical binary of this version can be reproduced by building from source code at commit 44164f10ca3fb44ce0e68519f13564b87e3aca61 associated with the tag v_1.5.30. Release built using Java "21" 2023-10-17 LTS build 21.0.1.+12-LTS-29 under Linux Debian 11.6.