CVE-2026-54899 | Oj (Optimized JSON) is a JSON parser and Object marshaller p… | CVSS 6.3 MEDIUM

Description

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to version 3.17.2, disabling symbol_keys on a reused Oj::Parser instance triggers a heap use-after-free. When symbol_keys is toggled from true to false, opt_symbol_keys_set frees the internal key cache (cache_free) but does not clear the pointer. The next parse call reads from the freed cache via cache_intern, producing a use-after-free. This issue has been fixed in version 3.17.2.

Metadata

CVE ID: CVE-2026-54899
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-16 13:49 UTC
Published: 2026-06-30 23:03 UTC
Last updated: 2026-06-30 23:03 UTC
Primary CWE: CWE-416
CWE-416: Use After Free
Vendor / Product: ohler55 / oj
Sources: cve.org · NVD

Severity & Metrics

6.3 MEDIUM CVSS 4.0

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

References (1)

https://github.com/ohler55/oj/security/advisories/GHSA-2cw7-v8ff-p88r https://github.com/ohler55/oj/security/advisories/GHSA-2cw7-v8ff-p88r