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CVE-2026-54512 is a polymorphic-deserialization validation bypass in jackson-databind, introduced in version 2.10.0 and fixed in versions 2.18.8, 2.21.4, and 3.1.4 for their respective branches. When a type identifier contains generic parameters, DatabindContext._resolveAndValidateGeneric() validates only the raw container class against the configured PolymorphicTypeValidator. After approving that container, it uses TypeFactory.constructFromCanonical() to resolve the complete parameterized type without validating nested type arguments. An attacker controlling the type identifier can consequently cause otherwise-denied classes to be loaded, instantiated, and populated with attacker-controlled JSON properties. This bypasses the configured allow-list and can enable arbitrary code execution when suitable gadget classes are available.
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No valid public exploits. Mallory filtered out 3 candidates as fakes, detection scripts, or README-only repos.
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42 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An arbitrary-code-execution vulnerability in Jackson-databind caused by a PolymorphicTypeValidator bypass, affecting installed packages on Rocky Linux 9 hosts covered by CIQ advisory crlsa-2026_40895.
Jackson Databind arbitrary-code-execution vulnerability through a PolymorphicTypeValidator bypass.
Jackson Databind arbitrary code execution through a PolymorphicTypeValidator bypass.
A Jackson Databind arbitrary-code-execution vulnerability caused by bypassing PolymorphicTypeValidator.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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