CVE-2026-54899

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.

Score
CVSS 4.0 6.3 Medium
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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