Use After Free Affecting oj package, versions <3.17.3
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUBY-OJ-17393950
- published22 Jun 2026
- disclosed19 Jun 2026
- creditUnknown
Introduced: 19 Jun 2026
NewCVE-2026-54899 (opens in a new tab)How to fix?
Upgrade oj to version 3.17.3 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free in the opt_symbol_keys_set. An attacker can cause the application to read from freed memory by toggling the symbol_keys option from true to false on a reused parser instance and then invoking the parse method.