CVE-2026-54897 Details
Description
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to 3.17.2, Oj::Doc iterators (each_value, each_child, each_leaf) were vulnerable to a heap use-after-free. When a Ruby block yielded during iteration calls doc.close or d.close, the document's heap memory is freed while the C iterator is still running. When control returns from the block, the iterator reads from the freed region, producing a use-after-free accessible from pure Ruby. This issue has been fixed in version 3.17.2.
A heap use-after-free vulnerability has been identified in the Oj Ruby gem, specifically in the Doc iterators 'each_value', 'each_child', and 'each_leaf', prior to version 3.17.2. The issue arises when a Ruby block yields during iteration and calls 'doc.close' or 'd.close'. This action frees the document's heap memory while the C iterator is still processing. Once the block execution is complete, the iterator attempts to read from the freed memory, creating a use-after-free condition that can be exploited from pure Ruby.
Users are advised to upgrade to version 3.17.2 of the Oj Ruby gem, 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
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/ohler55/oj/security/advisories/GHSA-9ppp-w3g4-fh4q | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/ohler55/oj/security/advisories/GHSA-9ppp-w3g4-fh4q | [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] |