CVE-2026-54897

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to 3.17.2, Oj::Doc iterators (each_value, each_child, each_leaf) were vulnerable to a heap use-after-free. When a Ruby block yielded during iteration calls doc.close or d.close, the document's heap memory is freed while the C iterator is still running. When control returns from the block, the iterator reads from the freed region, producing a use-after-free accessible from pure Ruby. This issue has been fixed in version 3.17.2.

• CWE-416

• https://github.com/ohler55/oj/security/advisories/GHSA-9ppp-w3g4-fh4q
• https://github.com/ohler55/oj/security/advisories/GHSA-9ppp-w3g4-fh4q

Published

Jul 1, 2026

Last Modified

Jul 1, 2026

Status

Deferred

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