CVE-2026-10532
Description
A flaw was found in the logback-core component of QOS.CH Sarl logback. This deserialization of untrusted data vulnerability allows a remote attacker, by influencing serialized data sent to SimpleSocketServer or SimpleSSLSocketServer, to instantiate Proxy objects. Although heavily restricted by HardenedObjectInputStream, this issue constitutes a bypass of the intended security restrictions.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Mitigation
To mitigate this issue, restrict network access to any services that utilize `SimpleSocketServer` or `SimpleSSLSocketServer` from the logback-core component. If these components are not required for your application's functionality, consider disabling their use or ensuring they are not exposed to untrusted networks. This reduces the attack surface by preventing an attacker from influencing serialized data.
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Application Data; Unexpected State
Attackers can modify unexpected objects or data that was assumed to be safe from modification. Deserialized data or code could be modified without using the provided accessor functions, or unexpected functions could be invoked.
Availability
Technical Impact: DoS: Resource Consumption (CPU)
If a function is making an assumption on when to terminate, based on a sentry in a string, it could easily never terminate.
Other
Technical Impact: Varies by Context
The consequences can vary widely, because it depends on which objects or methods are being deserialized, and how they are used. Making an assumption that the code in the deserialized object is valid is dangerous and can enable exploitation. One example is attackers using gadget chains to perform unauthorized actions, such as generating a shell.
Frequently Asked Questions
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