CVE-2026-54897 | Oj (Optimized JSON) is a JSON parser and Object marshaller p… | CVSS 2.1 LOW

Description

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to 3.17.2, Oj::Doc iterators (each_value, each_child, each_leaf) were vulnerable to a heap use-after-free. When a Ruby block yielded during iteration calls doc.close or d.close, the document's heap memory is freed while the C iterator is still running. When control returns from the block, the iterator reads from the freed region, producing a use-after-free accessible from pure Ruby. This issue has been fixed in version 3.17.2.

Metadata

CVE ID: CVE-2026-54897
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-16 13:49 UTC
Published: 2026-06-30 23:22 UTC
Last updated: 2026-06-30 23:22 UTC
Primary CWE: CWE-416
CWE-416: Use After Free
Vendor / Product: ohler55 / oj
Sources: cve.org · NVD

Severity & Metrics

2.1 LOW CVSS 4.0

CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Affected products (1)

Vendor	Product	Platform	Versions
ohler55	oj	—	< 3.17.2

Weakness (CWE)

CWE	Source	Description
CWE-416	cna	CWE-416: Use After Free

CVSS scores (1)

Score	Severity	Version	Source	Vector
2.1	LOW	4.0	cna	CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References (1)

https://github.com/ohler55/oj/security/advisories/GHSA-9ppp-w3g4-fh4q https://github.com/ohler55/oj/security/advisories/GHSA-9ppp-w3g4-fh4q