CVE-2026-54897 – Oj : Use-After-Free in Oj::Doc Iterators via Reentrant Close

CVE ID :CVE-2026-54897

Published : June 30, 2026, 11:22 p.m. | 23 minutes ago

Description :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.

Severity: 0.0 | NA

Visit the link for more details, such as CVSS details, affected products, timeline, and more…