CVE-2026-54899
Oj: Use-After-Free in Oj::Parser Symbol Key Cache Toggle
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-416 |
| Vendor | ohler55 |
| Product | oj |
| Published | Jun 30, 2026 |
Stay Ahead of the Next One
Get instant alerts for ohler55 oj
Be the first to know when new unknown vulnerabilities affecting ohler55 oj are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
Affected Versions
ohler55 / oj
< 3.17.2