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 (CVSS)
| Base score | 2.1 |
|---|---|
| Severity | Low |
| Version | CVSS 4.0 |
| Vector | CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N |
| Provided by | CNA |
Weaknesses
- CWE-416 — CWE-416: Use After Free
Affected products
| Vendor | Product | Versions |
|---|---|---|
| ohler55 | oj | < 3.17.2 |
References
- https://github.com/ohler55/oj/security/advisories/GHSA-9ppp-w3g4-fh4q (x_refsource_CONFIRM)
Generated from the official CVE List on 01 Jul 2026 07:05 UTC.