CVE-2026-54502
Oj: Stack Buffer Overflow in Oj.dump via Large Indent
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj.dump is vulnerable to a stack-based buffer overflow when a large :indent value is provided by the developer. fill_indent in dump.h calls memset(indent_str, ' ', (size_t)opts->indent) without validating the size. When opts->indent is set to INT_MAX (2,147,483,647), the (size_t) cast preserves the large value and memset writes 2 GB into the stack-allocated out buffer (4,184 bytes), corrupting the stack and crashing the process. This issue has been fixed in version 3.17.2.
| CWE | CWE-121 |
| Vendor | ohler55 |
| Product | oj |
| Published | Jun 30, 2026 |
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Affected Versions
ohler55 / oj
< 3.17.2