# json-jwt (RubyGems) vulnerabilities

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

Junglewise Threat Intelligence has tracked 3 vulnerabilities in json-jwt (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-2023-51774, was published on 29 February 2024.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 3 (0 critical, 0 exploited in the wild)

## About json-jwt (RubyGems)

Ruby library for encoding and decoding JSON Web Tokens (JWT) for authentication and authorization.

## Latest json-jwt (RubyGems) vulnerabilities

- [CVE-2023-51774: json-jwt allows bypass of identity checks via a sign/encryption confusion attack](https://junglewise.ai/threats/cve-2023-51774-json-jwt-allows-bypass-of-identity-checks-via-a-sign-encryption) (info, published 29 Feb 2024)
- [CVE-2019-18848: JSON-jwt Gem lacked element count during splitting of JWE string](https://junglewise.ai/threats/cve-2019-18848-json-jwt-gem-lacked-element-count-during-splitting-of-jwe-string) (low, CVSS 3.1, published 14 Nov 2019)
- [CVE-2018-1000539: Json-jwt did not verify the cryptographic signature for data](https://junglewise.ai/threats/cve-2018-1000539-json-jwt-did-not-verify-the-cryptographic-signature-for-data) (low, CVSS 3, published 31 Jul 2018)

## Most severe json-jwt (RubyGems) vulnerabilities

- [CVE-2019-18848: JSON-jwt Gem lacked element count during splitting of JWE string](https://junglewise.ai/threats/cve-2019-18848-json-jwt-gem-lacked-element-count-during-splitting-of-jwe-string) (low, CVSS 3.1, published 14 Nov 2019)
- [CVE-2018-1000539: Json-jwt did not verify the cryptographic signature for data](https://junglewise.ai/threats/cve-2018-1000539-json-jwt-did-not-verify-the-cryptographic-signature-for-data) (low, CVSS 3, published 31 Jul 2018)
- [CVE-2023-51774: json-jwt allows bypass of identity checks via a sign/encryption confusion attack](https://junglewise.ai/threats/cve-2023-51774-json-jwt-allows-bypass-of-identity-checks-via-a-sign-encryption) (info, published 29 Feb 2024)

## 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, "json-jwt (RubyGems) vulnerabilities", https://junglewise.ai/threats/technologies/json-jwt, 13 November 2026.