high8.7
CVE-2026-54899
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 version 3.17.2, disabling symbol_keys on a reused Oj::Parser instance triggers a heap use-after-free. When symbol_keys is toggled from true to false, opt_symbol_keys_set frees the internal key cache (cache_free) but does not clear the pointer. The next parse call reads from the freed cache via cache_intern, producing a use-after-free. This issue has been fixed in version 3.17.2.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rubygems | oj | < 3.17.2 | 3.17.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-2cw7-v8ff-p88r
- https://github.com/ohler55/oj/security/advisories/GHSA-2cw7-v8ff-p88r
- https://nvd.nist.gov/vuln/detail/CVE-2026-54899
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/oj/CVE-2026-54899.yml
- https://www.cve.org/CVERecord/SearchResults?query=CVE-2026-54899