AIKIDO-2026-11154
oj is vulnerable to Stack-based Buffer Overflow
31
Low Risk
This Affects:
ojTL;DR
The Oj.dump serializer accepts an integer indent option without bounding its magnitude. When an extreme indent value is supplied, fill_indent writes far beyond the stack-allocated output buffer and corrupts the stack. Before the fix, this could crash the Ruby process handling the dump call. The patch rejects indent values above a small fixed maximum.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and untrusted input can influence the indent option passed to Oj.dump.
Background info
oj is vulnerable to Stack-based Buffer Overflow in versions 0.0.1 - 3.17.1.
How to fix this
Upgrade the oj library to the patch version.
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