CVE-2026-54896 – Oj: Heap Buffer Overflow in Oj.dump Exception Serialization via Large Indent

CVE ID :CVE-2026-54896

Published : June 30, 2026, 11:20 p.m. | 26 minutes ago

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.

Severity: 0.0 | NA

Visit the link for more details, such as CVSS details, affected products, timeline, and more…