CVE-2026-54512

A flaw was found in jackson-databind. This vulnerability allows a remote attacker to bypass the PolymorphicTypeValidator (PTV) when polymorphic typing is enabled and a type identifier contains generic parameters. By crafting a malicious type ID, an attacker can place a denied class as a generic type parameter of an allowed container. This leads to the loading and instantiation of arbitrary classes, potentially resulting in arbitrary code execution.

This vulnerability in jackson-databind is rated as Important. While it describes a potential bypass of the PolymorphicTypeValidator leading to arbitrary code execution, exploitation requires an attacker to already possess administrative privileges, specifically the manage-realm role. This flaw does not enable privilege escalation, as it does not grant additional capabilities beyond those inherently available to an existing administrator.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.