Out-of-bounds Read in Ohler55 Oj
CVE-2026-54500
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.3, Oj.load in :object mode reads uninitialized stack memory (and, for long keys, reads out of bounds) when parsing a JSON object w…
Vulnerability class: Buffer Overflow
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Ohler55 Oj — versions < 3.17.3
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-54500?
- CVE-2026-54500 is a medium-severity vulnerability in Ohler55 Oj, classified under Out-of-bounds Read. CVSS score: 5.3/10. Published 2026-07-01.
- How severe is CVE-2026-54500?
- Medium severity. CVSS v3 base score is 5.3 out of 10.