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CVE-2026-41731 is an unsafe deserialization vulnerability in Spring for Apache Kafka's JsonKafkaHeaderMapper and deprecated DefaultKafkaHeaderMapper. The mappers used prefix-based matching for trusted packages, causing a configured trusted package to implicitly trust all subordinate package namespaces. In conjunction with Jackson default bean deserialization, crafted Kafka type-header values from a producer can cause a consuming application to deserialize arbitrary JDK types. Affected versions are 4.0.0–4.0.5, 3.3.0–3.3.15, 3.2.0–3.2.13, 2.9.0–2.9.13, and 2.8.0–2.8.11.
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An input validation defect in messaging components affecting header configuration handling, enabling arbitrary class execution through crafted headers.
A deserialization-related vulnerability in Spring for Apache Kafka where trusted package checks used a prefix match in JsonKafkaHeaderMapper and DefaultKafkaHeaderMapper, allowing crafted header values to trigger deserialization of arbitrary JDK types.
A high-severity deserialization vulnerability in Spring for Apache Kafka caused by overly broad trusted-package matching in JsonKafkaHeaderMapper and DefaultKafkaHeaderMapper, allowing crafted headers to trigger deserialization of arbitrary JDK types with potentially dangerous side effects.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.