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CVE-2026-54896 is a heap buffer overflow vulnerability in the Oj Ruby gem, a high-performance JSON parser and object marshaller. In versions prior to 3.17.2, when operating in object mode, Oj.dump can overflow a heap-allocated buffer while serializing Exception objects if a large indent value is supplied. The vulnerable serialization logic allocates a buffer sized for the object's attributes but fails to account for the additional bytes introduced by indentation on each write. As a result, repeated insertion of large indentation strings can exceed the allocated heap buffer and corrupt adjacent heap memory. The issue is triggered specifically during Exception object serialization in object mode and has been fixed in version 3.17.2.
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No public exploit code observed for this vulnerability.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Every observed campaign linking this CVE to a named adversary.
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YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.