CVE-2026-54513

A flaw was found in jackson-databind, a library used for processing data. This vulnerability allows an attacker to bypass security controls designed to validate data types. By sending specially crafted input, an attacker can force the system to process untrusted data, which may lead to the execution of malicious code. This could result in a complete compromise of the affected system, impacting its confidentiality, integrity, and availability.

This Important flaw in jackson-databind allows for a security bypass, enabling arbitrary code execution. The vulnerability arises from insufficient validation of array component types by BasicPolymorphicTypeValidator, which permits deserialization of unallowlisted types when processing untrusted input. This bypass of type validation can lead to a complete system compromise, affecting confidentiality, integrity, and availability in Red Hat products utilizing jackson-databind for data processing.

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.

Upgrade to version 2.18.8, 2.21.4, or 3.1.4 or later to address this vulnerability. If upgrading is not immediately possible, remove BasicPolymorphicTypeValidator.Builder.allowIfSubTypeIsArray() from the application’s ObjectMapper configuration to eliminate the affected deserialization path. Rebuild and restart the application to apply the configuration change.

As an additional mitigation, disable polymorphic deserialization of untrusted data where possible by avoiding or removing default typing features such as activateDefaultTyping() or enableDefaultTyping(). When polymorphic deserialization is required, restrict allowed subtypes using a strict whitelist of trusted application packages and avoid broad or permissive type validation rules.