Use After Free Affecting oj package, versions <3.17.3
Threat Intelligence
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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-17393954
- published22 Jun 2026
- disclosed19 Jun 2026
- creditUnknown
Introduced: 19 Jun 2026
NewCVE-2026-54900 (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 form_attr function when handling JSON object keys of exactly 65,535 bytes with create_id enabled. An attacker can cause heap memory corruption and crash the process by supplying a specially crafted JSON payload with an oversized key.