CVE-2026-54502

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-121

• https://github.com/ohler55/oj/security/advisories/GHSA-3v45-f3vh-wg7m
• https://github.com/ohler55/oj/security/advisories/GHSA-3v45-f3vh-wg7m

Published

Jul 1, 2026

Last Modified

Jul 1, 2026

Status

Deferred

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