Threat Intelligence Database

ACE vulnerability in conditional configuration file processing by QOS.CH logback-core up to and including version 1.5.34 in Java applications, allows an attacker to execute arbitrary code circumventing existing protections against CVE-2025-11226 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 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 is a deserialization of untrusted data vulnerability in QOS.CH Sarl logback logback-core (HardenedObjectInputStream module) that allows restricted object injection. An attacker who can influence serialized data sent to SimpleSocketServer or SimpleSSLSocketServer can instantiate Proxy objects. Although the deserialization process is heavily restricted and no practical remote code execution or significant privilege escalation has been identified, this vulnerability bypasses intended security restrictions. It affects logback versions from 0 up to and including 1.5.33.

CVE-2026-9828 is a deserialization of untrusted data vulnerability in QOS. CH Sarl's logback-core module, specifically in HardenedObjectInputStream. An attacker who can influence serialized data sent to SimpleSocketServer or SimpleSSLSocketServer can instantiate certain objects from java.lang and java.util packages that are not explicitly blocked. The deserialization restrictions are strong, and no practical remote code execution or significant privilege escalation has been identified. This vulnerability affects logback versions through 1.5.32 inclusive. The CVSS score is low (2.