RHLW-2026-4f8afe0cda7c5f03

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RHLW-2026-4f8afe0cda7c5f03

Summary: Lightwell Security Advisory: logback-classic 1.5.16.rhlw-00003

Details: Red Hat Lightwell has released ch.qos.logback:logback-classic 1.5.16.rhlw-00003 with backported fixes for CVE-2026-104721 and CVE-2026-19880. CVE-2026-104721: Path-traversal vulnerability in QOS.CH Sarl Logback-classic on Java (logback-classic module) allows path-traversal vulnerability. More specifically, an MDC-based discriminator value flows unsanitized into a nested FileAppender path, letting an attacker who influences that MDC value (e.g. via an HTTP header) create and append log files outside the intended directory. This issue affects Logback-classic: from 0.9.14 through 1.6.4.  This vulnerability is similar to CVE-2026-19880 but involves other attack techniques. CVE-2026-19880: Path-traversal vulnerability in QOS.CH Sarl Logback-classic on Java (logback-classic module) allows path-traversal vulnerability. More specifically, an MDC-based discriminator value flows unsanitized into a nested FileAppender path, letting an attacker who influences that MDC value (e.g. via an HTTP header) create and append log files outside the intended directory. This issue affects Logback-classic: from 0.9.14 through 1.6.2. This patched artifact is a drop-in replacement for ch.qos.logback:logback-classic 1.5.16 from Maven Central.

References: https://nvd.nist.gov/vuln/detail/CVE-2026-104721, https://nvd.nist.gov/vuln/detail/CVE-2026-19880