CVE-2026-54899 Details
Description
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.
A heap use-after-free vulnerability has been identified in the Oj (Optimized JSON) Ruby gem, prior to version 3.17.2. The issue arises when the 'symbol_keys' option is disabled on a reused Oj::Parser instance. Toggling 'symbol_keys' from true to false frees the internal key cache but fails to nullify the pointer. Consequently, the next parsing operation reads from the freed cache, leading to a use-after-free condition.
Users are advised to update to Oj version 3.17.2 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 1, 2026CISA-ADP
Assessed Jul 1, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/ohler55/oj/security/advisories/GHSA-2cw7-v8ff-p88r | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/ohler55/oj/security/advisories/GHSA-2cw7-v8ff-p88r | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Oj | < 3.17.2 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 1, 2026 | CVE Modified | CISA-ADP |
| Jul 1, 2026 | New CVE Received | [email protected] |