high8.7
CVE-2026-54897
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rubygems | oj | <= 3.17.2 | 3.17.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-9ppp-w3g4-fh4q
- https://github.com/ohler55/oj/security/advisories/GHSA-9ppp-w3g4-fh4q
- https://nvd.nist.gov/vuln/detail/CVE-2026-54897
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/oj/CVE-2026-54897.yml
- https://www.cve.org/CVERecord/SearchResults?query=CVE-2026-54897