CVE-2026-54896
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.
- Score
- CVSS 4.0 2.1 Low
- Status
- Deferred - security-advisories@github.com
- Published
- 2026-06-30
- Last modified
- 2026-10-25
- Weaknesses
- CWE-122
Affected products
References
- https://github.com/ohler55/oj/security/advisories/GHSA-35w3-pjm6-wj95
