# Ruby vulnerabilities

Source: https://junglewise.ai/threats/vendors/ruby  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 12 November 2026, 20:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/vendors/ruby.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 8 vulnerabilities in Ruby: 1 in the last 7 days and 6 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-125110, was published on 9 November 2026. 1 vulnerability in the last four weeks, level on the four before (1).

## Counts

- Last 7 days: 1
- Last 30 days: 2
- Last 90 days: 6
- All time: 8 (0 critical, 0 exploited in the wild)

## About Ruby

The maintainers and community behind the Ruby programming language.

## Latest Ruby vulnerabilities

- [CVE-2026-125110: Rack::Static header_rules bypass via dot-segment normalization mismatch](https://junglewise.ai/threats/cve-2026-125110-rack-rack-static-header-rules-bypass-via-dot-segment) (medium, CVSS 5.3, published 9 Nov 2026)
- [CVE-2026-116695: Crass CSS parser bad URL tokenizer bypass in sanitizers](https://junglewise.ai/threats/cve-2026-116695-crass-is-a-ruby-css-parser-that-is-compliant-with-the-css-syntax) (medium, CVSS 4, published 27 Oct 2026)
- [CVE-2026-12545: rubygem-hammer_cli command injection via insecure editor invocation](https://junglewise.ai/threats/cve-2026-12545-a-flaw-was-found-in-rubygem-hammer-cli-a-command-injection) (medium, CVSS 6.7, published 1 Oct 2026)
- [CVE-2026-82455: RubyGems symlink-following behavior in gem extraction](https://junglewise.ai/threats/cve-2026-82455-rubygems-symlink-following-behavior-in-gem-extraction) (info, published 29 Aug 2026)
- [CVE-2026-80213: Ruby resolv DNS label encoding bypass](https://junglewise.ai/threats/cve-2026-80213-ruby-resolv-dns-label-encoding-bypass) (medium, CVSS 4, published 27 Aug 2026)
- [CVE-2026-80212: Ruby resolv memory exhaustion in DNS response parsing](https://junglewise.ai/threats/cve-2026-80212-ruby-resolv-memory-exhaustion-in-dns-response-parsing) (high, CVSS 7.5, published 27 Aug 2026)
- [CVE-2026-38969: Ruby WEBrick request smuggling via Content-Length in trailers](https://junglewise.ai/threats/cve-2026-38969-ruby-webrick-request-smuggling-via-content-length-in-trailers) (info, CVSS 0, published 2 Jul 2026)
- [CVE-2025-10990: Ruby REXML ReDoS in hex numeric character references](https://junglewise.ai/threats/cve-2025-10990-ruby-rexml-redos-in-hex-numeric-character-references) (high, CVSS 7.5, published 27 Feb 2026)

## Most severe Ruby vulnerabilities

- [CVE-2026-80212: Ruby resolv memory exhaustion in DNS response parsing](https://junglewise.ai/threats/cve-2026-80212-ruby-resolv-memory-exhaustion-in-dns-response-parsing) (high, CVSS 7.5, published 27 Aug 2026)
- [CVE-2025-10990: Ruby REXML ReDoS in hex numeric character references](https://junglewise.ai/threats/cve-2025-10990-ruby-rexml-redos-in-hex-numeric-character-references) (high, CVSS 7.5, published 27 Feb 2026)
- [CVE-2026-12545: rubygem-hammer_cli command injection via insecure editor invocation](https://junglewise.ai/threats/cve-2026-12545-a-flaw-was-found-in-rubygem-hammer-cli-a-command-injection) (medium, CVSS 6.7, published 1 Oct 2026)
- [CVE-2026-125110: Rack::Static header_rules bypass via dot-segment normalization mismatch](https://junglewise.ai/threats/cve-2026-125110-rack-rack-static-header-rules-bypass-via-dot-segment) (medium, CVSS 5.3, published 9 Nov 2026)
- [CVE-2026-116695: Crass CSS parser bad URL tokenizer bypass in sanitizers](https://junglewise.ai/threats/cve-2026-116695-crass-is-a-ruby-css-parser-that-is-compliant-with-the-css-syntax) (medium, CVSS 4, published 27 Oct 2026)
- [CVE-2026-80213: Ruby resolv DNS label encoding bypass](https://junglewise.ai/threats/cve-2026-80213-ruby-resolv-dns-label-encoding-bypass) (medium, CVSS 4, published 27 Aug 2026)
- [CVE-2026-38969: Ruby WEBrick request smuggling via Content-Length in trailers](https://junglewise.ai/threats/cve-2026-38969-ruby-webrick-request-smuggling-via-content-length-in-trailers) (info, CVSS 0, published 2 Jul 2026)
- [CVE-2026-82455: RubyGems symlink-following behavior in gem extraction](https://junglewise.ai/threats/cve-2026-82455-rubygems-symlink-following-behavior-in-gem-extraction) (info, published 29 Aug 2026)

## Vulnerabilities per week

1 vulnerability in the last four weeks, level on the four before (1).

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 3 | 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 | 1 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 1 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 1 | 0 | 0 |

## 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, "Ruby vulnerabilities", https://junglewise.ai/threats/vendors/ruby, 12 November 2026.