CVE WatchJul 1, 2026

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 s

CVSS

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No CVSS

EPSS

0.3%

p17

KEV

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Exploit Today

0-100

Published: Jul 1, 2026 · Last modified: Jul 1, 2026 · CWE-121

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-07-012026-07-20

Technical description

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.

Official references

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