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.

Score
CVSS 4.0 2.1 Low
Status
Deferred - security-advisories@github.com
Published
2026-06-30
Last modified
2026-10-25
Weaknesses
CWE-416

Affected products

References

 
 
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