Description
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, when in object mode, Oj.dump is vulnerable to a heap buffer overflow when serializing Exception objects with a large :indent value. The serializer allocates a buffer sized for the object's attributes but does not account for the indent bytes added on each write. With indent: 5000, the accumulation of 5,000-byte indent strings overflows the 13,150-byte heap allocation, corrupting adjacent heap memory. 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-122 — CWE-122: Heap-based Buffer Overflow
Affected products
| Vendor | Product | Versions |
|---|---|---|
| ohler55 | oj | < 3.17.2 |
References
- https://github.com/ohler55/oj/security/advisories/GHSA-35w3-pjm6-wj95 (x_refsource_CONFIRM)
Generated from the official CVE List on 01 Jul 2026 07:05 UTC.