Technology · RubyGems
oj (RubyGems) vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 11 vulnerabilities in oj (RubyGems): 0 in the last 7 days and 11 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-54903, was published on 1 July 2026.
- Last 7 days
- 0
- Last 90 days
- 11
- Critical, all time
- 0
- Exploited in the wild
- 0
About oj (RubyGems)
Oj is a fast JSON parser and object serializer for the Ruby programming language.
Latest oj (RubyGems) vulnerabilities
- CVE-2026-54903: ohler55 Oj integer overflow in Oj.load heap corruptionhighCVSS 8.7
- CVE-2026-54902: ohler55 Oj use-after-free in Oj::Parser SAJ modehighCVSS 8.7
- CVE-2026-54901: ohler55 Oj Use-After-Free in Oj::Parser GC markinghighCVSS 8.7
- CVE-2026-54900: ohler55 Oj heap corruption in Oj::Parser via integer truncationhighCVSS 8.7
- CVE-2026-54899: ohler55 Oj heap use-after-free in Oj::Parser symbol_keys togglehighCVSS 8.7
- CVE-2026-54898: ohler55 Oj heap use-after-free in Oj::Parser#parsehighCVSS 8.7
- CVE-2026-54897: ohler55 Oj heap use-after-free in Oj::Doc iteratorshighCVSS 8.7
- CVE-2026-54896: ohler55 Oj heap buffer overflow in Exception serializationhighCVSS 8.7
- CVE-2026-54592: ohler55 Oj stack buffer overflow in Oj::Doc#each_childhighCVSS 7.5
- CVE-2026-54502: ohler55 Oj stack buffer overflow in Oj.dumphighCVSS 8.7
- CVE-2026-54500: ohler55 Oj uninitialized stack memory read in intern.cmediumCVSS 5.3
Most severe oj (RubyGems) vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-54903: ohler55 Oj integer overflow in Oj.load heap corruptionhighCVSS 8.7
- CVE-2026-54902: ohler55 Oj use-after-free in Oj::Parser SAJ modehighCVSS 8.7
- CVE-2026-54901: ohler55 Oj Use-After-Free in Oj::Parser GC markinghighCVSS 8.7
- CVE-2026-54900: ohler55 Oj heap corruption in Oj::Parser via integer truncationhighCVSS 8.7
- CVE-2026-54899: ohler55 Oj heap use-after-free in Oj::Parser symbol_keys togglehighCVSS 8.7
- CVE-2026-54898: ohler55 Oj heap use-after-free in Oj::Parser#parsehighCVSS 8.7
- CVE-2026-54897: ohler55 Oj heap use-after-free in Oj::Doc iteratorshighCVSS 8.7
- CVE-2026-54896: ohler55 Oj heap buffer overflow in Exception serializationhighCVSS 8.7
- CVE-2026-54502: ohler55 Oj stack buffer overflow in Oj.dumphighCVSS 8.7
- CVE-2026-54592: ohler55 Oj stack buffer overflow in Oj::Doc#each_childhighCVSS 7.5
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 11 | 0 | |
| 6 Jul 2026 | 0 | 0 | |
| 13 Jul 2026 | 0 | 0 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 0 | 0 | |
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 |
How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/oj.json, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "oj (RubyGems) vulnerabilities", https://junglewise.ai/threats/technologies/oj, 26 September 2026.