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CVE-2026-41855 is an unsafe deserialization vulnerability in Spring Framework's MappingJackson2MessageConverter and JacksonJsonMessageConverter. In untrusted JMS environments, attacker-controlled type identifiers in message headers can be resolved into arbitrary Java classes during polymorphic type resolution. The affected code loads unvalidated type information, permitting gadget-class deserialization and arbitrary class instantiation. Affected versions are Spring Framework 7.0.0 through 7.0.7, 6.2.0 through 6.2.18, 6.1.0 through 6.1.27, and 5.3.0 through 5.3.48.
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No public exploit code observed for this vulnerability.
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12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Spring Framework deserialization vulnerability that permits arbitrary class instantiation and potentially unauthorized actions in untrusted JMS environments.
An unsafe deserialization vulnerability in Spring Framework's Jackson JMS message converters. In untrusted JMS environments, attacker-controlled serialized data can instantiate arbitrary classes through deserialization gadgets, potentially resulting in unauthorized actions.
A Spring Framework deserialization-related vulnerability in JMS message converters that allows arbitrary class instantiation in untrusted JMS environments, potentially leading to unauthorized actions via gadget class deserialization.
A high-severity unsafe deserialization vulnerability in Spring Framework JMS message converters that can lead to remote code execution when an attacker can send crafted messages through an untrusted JMS broker.
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.