Description
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2,Oj::Parser#parse is vulnerable to a heap use-after-free when a SAJ/SAJ2 callback mutates the input JSON string during parsing. The C engine holds a raw const byte * pointer into the Ruby string's internal buffer. If a callback (e.g. hash_start) resizes the string — for example by calling String#replace with a longer value — Ruby reallocates the string buffer and frees the old one. The C parser's pointer is left dangling; the next character read at parser.c:607 is a use-after-free. This issue has been fixed in version 3.17.2.
Severity (CVSS)
| Base score | 2.1 |
|---|---|
| Severity | Low |
| Version | CVSS 4.0 |
| Vector | CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N |
| Provided by | CNA |
Weaknesses
- CWE-416 — CWE-416: Use After Free
Affected products
| Vendor | Product | Versions |
|---|---|---|
| ohler55 | oj | < 3.17.2 |
References
- https://github.com/ohler55/oj/security/advisories/GHSA-q2gm-54r6-8fwm (x_refsource_CONFIRM)
Generated from the official CVE List on 01 Jul 2026 07:05 UTC.