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CVE-2026-54900 is an integer-truncation flaw in the Oj Ruby gem's usual-mode parser when create_id is enabled. In affected releases, Oj::Parser#parse handles object attributes through form_attr, where a JSON object-key length of exactly 65,535 bytes is narrowed to a signed value of -1 before being supplied to memcpy. The resulting conversion to size_t makes memcpy attempt an extremely large copy, corrupting heap memory and crashing the Ruby process.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
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.