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.
Analysis and contextual insights are available on OpenCVE Cloud.
Remediation
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Advisories
| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-35w3-pjm6-wj95 | Oj: Heap Buffer Overflow in Oj.dump Exception Serialization via Large Indent |
References
History
Tue, 30 Jun 2026 23:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Oj: Heap Buffer Overflow in Oj.dump Exception Serialization via Large Indent | |
| Weaknesses | CWE-122 | |
| References |
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| Metrics |
cvssV4_0
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Subscriptions
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-06-30T23:20:27.524Z
Reserved: 2026-06-16T13:49:33.555Z
Link: CVE-2026-54896
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OpenCVE Enrichment
Updated: 2026-07-01T01:00:14Z
Weaknesses
Github GHSA