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Low severityNVD Advisory· Published Jul 1, 2026· Updated Jul 1, 2026

CVE-2026-54896

CVE-2026-54896

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
ojRubyGems
< 3.17.33.17.3

Affected products

26

Patches

Vulnerability mechanics

References

2

News mentions

0

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