Use of Uninitialized Resource 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-17393910
- published22 Jun 2026
- disclosed19 Jun 2026
- creditZac Wang
Introduced: 19 Jun 2026
NewCVE-2026-54500 (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 of Uninitialized Resource in the form_attr function when parsing a JSON object with a key of 254 bytes or longer using Oj.load in :object mode. An attacker can obtain sensitive stack memory contents by supplying a crafted JSON payload with an excessively long key, which may result in the application returning leaked memory via a Symbol or an EncodingError message.