# oj (RubyGems) vulnerabilities

Source: https://junglewise.ai/threats/technologies/oj  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/oj.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 11 vulnerabilities in oj (RubyGems): 0 in the last 7 days and 0 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.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 11 (0 critical, 0 exploited in the wild)

## 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 corruption](https://junglewise.ai/threats/cve-2026-54903-ohler55-oj-integer-overflow-in-oj-load-heap-corruption) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54902: ohler55 Oj use-after-free in Oj::Parser SAJ mode](https://junglewise.ai/threats/cve-2026-54902-ohler55-oj-use-after-free-in-oj-parser-saj-mode) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54901: ohler55 Oj Use-After-Free in Oj::Parser GC marking](https://junglewise.ai/threats/cve-2026-54901-ohler55-oj-use-after-free-in-oj-parser-gc-marking) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54900: ohler55 Oj heap corruption in Oj::Parser via integer truncation](https://junglewise.ai/threats/cve-2026-54900-ohler55-oj-heap-corruption-in-oj-parser-via-integer-truncation) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54899: ohler55 Oj heap use-after-free in Oj::Parser symbol_keys toggle](https://junglewise.ai/threats/cve-2026-54899-ohler55-oj-heap-use-after-free-in-oj-parser-symbol-keys-toggle) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54898: ohler55 Oj heap use-after-free in Oj::Parser#parse](https://junglewise.ai/threats/cve-2026-54898-ohler55-oj-heap-use-after-free-in-oj-parser-parse) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54897: ohler55 Oj heap use-after-free in Oj::Doc iterators](https://junglewise.ai/threats/cve-2026-54897-ohler55-oj-heap-use-after-free-in-oj-doc-iterators) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54896: ohler55 Oj heap buffer overflow in Exception serialization](https://junglewise.ai/threats/cve-2026-54896-ohler55-oj-heap-buffer-overflow-in-exception-serialization) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54592: ohler55 Oj stack buffer overflow in Oj::Doc#each_child](https://junglewise.ai/threats/cve-2026-54592-ohler55-oj-stack-buffer-overflow-in-oj-doc-each-child) (high, CVSS 7.5, published 1 Jul 2026)
- [CVE-2026-54502: ohler55 Oj stack buffer overflow in Oj.dump](https://junglewise.ai/threats/cve-2026-54502-ohler55-oj-stack-buffer-overflow-in-oj-dump) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54500: ohler55 Oj uninitialized stack memory read in intern.c](https://junglewise.ai/threats/cve-2026-54500-ohler55-oj-uninitialized-stack-memory-read-in-intern-c) (medium, CVSS 5.3, published 1 Jul 2026)

## Most severe oj (RubyGems) vulnerabilities

- [CVE-2026-54592: ohler55 Oj stack buffer overflow in Oj::Doc#each_child](https://junglewise.ai/threats/cve-2026-54592-ohler55-oj-stack-buffer-overflow-in-oj-doc-each-child) (high, CVSS 7.5, published 1 Jul 2026)
- [CVE-2026-54903: ohler55 Oj integer overflow in Oj.load heap corruption](https://junglewise.ai/threats/cve-2026-54903-ohler55-oj-integer-overflow-in-oj-load-heap-corruption) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54902: ohler55 Oj use-after-free in Oj::Parser SAJ mode](https://junglewise.ai/threats/cve-2026-54902-ohler55-oj-use-after-free-in-oj-parser-saj-mode) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54901: ohler55 Oj Use-After-Free in Oj::Parser GC marking](https://junglewise.ai/threats/cve-2026-54901-ohler55-oj-use-after-free-in-oj-parser-gc-marking) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54900: ohler55 Oj heap corruption in Oj::Parser via integer truncation](https://junglewise.ai/threats/cve-2026-54900-ohler55-oj-heap-corruption-in-oj-parser-via-integer-truncation) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54899: ohler55 Oj heap use-after-free in Oj::Parser symbol_keys toggle](https://junglewise.ai/threats/cve-2026-54899-ohler55-oj-heap-use-after-free-in-oj-parser-symbol-keys-toggle) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54502: ohler55 Oj stack buffer overflow in Oj.dump](https://junglewise.ai/threats/cve-2026-54502-ohler55-oj-stack-buffer-overflow-in-oj-dump) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54898: ohler55 Oj heap use-after-free in Oj::Parser#parse](https://junglewise.ai/threats/cve-2026-54898-ohler55-oj-heap-use-after-free-in-oj-parser-parse) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54897: ohler55 Oj heap use-after-free in Oj::Doc iterators](https://junglewise.ai/threats/cve-2026-54897-ohler55-oj-heap-use-after-free-in-oj-doc-iterators) (high, CVSS 4, published 1 Jul 2026)
- [CVE-2026-54896: ohler55 Oj heap buffer overflow in Exception serialization](https://junglewise.ai/threats/cve-2026-54896-ohler55-oj-heap-buffer-overflow-in-exception-serialization) (high, CVSS 4, published 1 Jul 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other RubyGems technologies

- [actionpack (RubyGems)](https://junglewise.ai/threats/technologies/actionpack): 77 vulnerabilities
- [nokogiri (RubyGems)](https://junglewise.ai/threats/technologies/nokogiri): 69 vulnerabilities
- [rack (RubyGems)](https://junglewise.ai/threats/technologies/rack): 55 vulnerabilities
- [activerecord (RubyGems)](https://junglewise.ai/threats/technologies/rubygems-activerecord): 26 vulnerabilities
- [rubygems-update (RubyGems)](https://junglewise.ai/threats/technologies/rubygems-update): 25 vulnerabilities
- [puppet (RubyGems)](https://junglewise.ai/threats/technologies/puppet): 23 vulnerabilities
- [activesupport (RubyGems)](https://junglewise.ai/threats/technologies/activesupport): 20 vulnerabilities
- [actionview (RubyGems)](https://junglewise.ai/threats/technologies/actionview): 19 vulnerabilities
- [activestorage (RubyGems)](https://junglewise.ai/threats/technologies/activestorage): 19 vulnerabilities
- [camaleon_cms (RubyGems)](https://junglewise.ai/threats/technologies/camaleon-cms): 19 vulnerabilities
- [rails-html-sanitizer (RubyGems)](https://junglewise.ai/threats/technologies/rails-html-sanitizer): 18 vulnerabilities
- [loofah (RubyGems)](https://junglewise.ai/threats/technologies/loofah): 17 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "oj (RubyGems) vulnerabilities", https://junglewise.ai/threats/technologies/oj, 13 November 2026.