CVE-2023-6378

A serialization vulnerability in logback receiver component part of logback allows an attacker to mount a Denial-Of-Service attack by sending poisoned data.

This is only exploitable if logback receiver component is deployed. See https://logback.qos.ch/manual/receivers.html

Logback is intended as a successor to the popular log4j project.

Security Fix(es):

A serialization vulnerability in logback receiver component part of logback version 1.4.11 allows an attacker to mount a Denial-Of-Service attack by sending poisoned data.

(CVE-2023-6378)

A serialization vulnerability in logback receiver component part of logback version 1.4.13, 1.3.13 and 1.2.12 allows an attacker to mount a Denial-Of-Service attack by sending poisoned data.

(CVE-2023-6481)

Red Hat Lightwell has released ch.qos.logback:logback-core 1.2.12.rhlw-00005 with backported fixes for CVE-2023-6378 and CVE-2024-12801.

CVE-2023-6378: Logback "receiver" DOS vulnerability

CVE-2024-12801: Server-Side Request Forgery (SSRF) in SaxEventRecorder by QOS.CH logback version 0.1 to 1.3.14 and 1.4.0 to 1.5.12  on the Java platform, allows an attacker to forge requests by compromising logback configuration files in XML.

The attacks involves the modification of DOCTYPE declaration in  XML configuration files.

This patched artifact is a drop-in replacement for ch.qos.logback:logback-core 1.2.12 from Maven Central.

Red Hat Lightwell has released ch.qos.logback:logback-classic 1.2.11.rhlw-00001 with a backported security fix.

CVE-2023-6378: Logback "receiver" DOS vulnerability

This patched artifact is a drop-in replacement for ch.qos.logback:logback-classic 1.2.11 from Maven Central.

Red Hat Lightwell has released ch.qos.logback:logback-classic 1.2.12.rhlw-00005 with backported fixes for CVE-2023-6378 and CVE-2024-12801.

CVE-2023-6378: Logback "receiver" DOS vulnerability

CVE-2024-12801: Server-Side Request Forgery (SSRF) in SaxEventRecorder by QOS.CH logback version 0.1 to 1.3.14 and 1.4.0 to 1.5.12  on the Java platform, allows an attacker to forge requests by compromising logback configuration files in XML.

The attacks involves the modification of DOCTYPE declaration in  XML configuration files.

This patched artifact is a drop-in replacement for ch.qos.logback:logback-classic 1.2.12 from Maven Central.

Red Hat Lightwell has released ch.qos.logback:logback-core 1.2.11.rhlw-00001 with backported fixes for CVE-2023-6378, CVE-2024-12798, CVE-2024-12801, CVE-2025-11226, CVE-2026-10532, CVE-2026-1225, and CVE-2026-9828.

CVE-2023-6378: Logback "receiver" DOS vulnerability

CVE-2024-12798: ACE vulnerability in JaninoEventEvaluator by QOS.CH logback-core upto including version 0.1 to 1.3.14 and 1.4.0 to 1.5.12 in Java applications allows attacker to execute arbitrary code by compromising an existing logback configuration file or by injecting an environment variable before program execution.

Malicious logback configuration files can allow the attacker to execute arbitrary code using the JaninoEventEvaluator extension.

A successful attack requires the user to have write access to a configuration file. Alternatively, the attacker could inject a malicious environment variable pointing to a malicious configuration file. In both cases, the attack requires existing privilege.

CVE-2024-12801: Server-Side Request Forgery (SSRF) in SaxEventRecorder by QOS.CH logback version 0.1 to 1.3.14 and 1.4.0 to 1.5.12  on the Java platform, allows an attacker to forge requests by compromising logback configuration files in XML.

The attacks involves the modification of DOCTYPE declaration in  XML configuration files.

CVE-2025-11226: ACE vulnerability in conditional configuration file processing by QOS.CH logback-core up to and including version 1.5.18 in Java applications, allows an attacker to execute arbitrary code by compromising an existing logback configuration file or by injecting an environment variable before program execution.

A successful attack requires the presence of Janino library and Spring Framework to be present on the user's class path. In addition, the attacker must  have write access to a configuration file. Alternatively, the attacker could inject a malicious environment variable pointing to a malicious configuration file. In both cases, the attack requires existing privilege.

CVE-2026-10532: Logback deserialization whitelist bypass for Proxy objects

CVE-2026-1225: ACE vulnerability in configuration file processing by QOS.CH logback-core up to and including version 1.5.24 in Java applications, allows an attacker to instantiate classes already present on the class path by compromising an existing logback configuration file.

The instantiation of a potentially malicious Java class requires that said class is present on the user's class-path. In addition, the attacker must have write access to a configuration file. However, after successful instantiation, the instance is very likely to be discarded with no further ado.

CVE-2026-9828: Logback deserialization whitelist bypass for java.lang and java.util

This patched artifact is a drop-in replacement for ch.qos.logback:logback-core 1.2.11 from Maven Central.

Root has patched CVE-2023-6378 in the ch.qos.logback:logback-core package for Root:Maven. Multiple fixed versions available.

A serialization vulnerability in logback receiver component part of logback version 1.4.11 allows an attacker to mount a Denial-Of-Service attack by sending poisoned data.

TuxCare rebuilt 2 ch.qos.logback packages to address 4 CVEs. Fixed in 1.1.7-tuxcare.1.

These are all security issues fixed in the logback-1.2.13-1.1 package on the GA media of openSUSE Tumbleweed.

It was discovered that logback could read malicious configuration files from LDAP servers. An attacker with the required permissions could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2021-42550) It was discovered that logback contained a serialization vulnerability. An attacker could possibly use this issue to cause a denial of service. (CVE-2023-6378)