Vendor
Ruby vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 13 vulnerabilities in Ruby: 0 in the last 7 days and 4 in the last 90 days, 2 of them critical and 0 exploited in the wild. The most recent, CVE-2026-82455, was published on 29 August 2026.
- Last 7 days
- 0
- Last 90 days
- 4
- Critical, all time
- 2
- Exploited in the wild
- 0
About Ruby
The maintainers and community behind the Ruby programming language.
Latest Ruby vulnerabilities
- CVE-2026-82455: RubyGems symlink-following behavior in gem extractioninfo
- CVE-2026-80213: Ruby resolv DNS label encoding bypassmediumCVSS 4EPSS 0.4%
- CVE-2026-80212: Ruby resolv memory exhaustion in DNS response parsinghighCVSS 7.5EPSS 0.6%
- CVE-2026-38969: Ruby WEBrick request smuggling via Content-Length in trailersinfoCVSS 0
- CVE-2026-47242: Ruby Net::IMAP command injection in ID and ENABLE commandsmediumCVSS 5.8
- CVE-2026-47241: Ruby Net::IMAP denial of service via incomplete raw argument validationlowCVSS 2.1
- CVE-2026-47240: Ruby Net::IMAP command injection via non-synchronizing literalsmediumCVSS 5.8
- CVE-2026-42257: Ruby Net::IMAP command injection in multiple commandscriticalCVSS 9.8EPSS 0.4%
- CVE-2026-42256: Ruby Net::IMAP computational DoS in SCRAM authenticationmediumCVSS 6.5EPSS 0.1%
- CVE-2026-42246: Ruby Net::IMAP STARTTLS stripping vulnerabilityhighCVSS 7.4EPSS 0.1%
- CVE-2026-42245: Ruby Net::IMAP denial of service in ResponseReaderhighCVSS 7.5EPSS 0.1%
- CVE-2026-27820: Ruby zlib buffer overflow in Zlib::GzipReadercriticalCVSS 9.8EPSS 0.0%
- CVE-2025-10990: Ruby REXML ReDoS in hex numeric character referenceshighCVSS 7.5EPSS 0.4%
Most severe Ruby vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-42257: Ruby Net::IMAP command injection in multiple commandscriticalCVSS 9.8EPSS 0.4%
- CVE-2026-27820: Ruby zlib buffer overflow in Zlib::GzipReadercriticalCVSS 9.8EPSS 0.0%
- CVE-2026-80212: Ruby resolv memory exhaustion in DNS response parsinghighCVSS 7.5EPSS 0.6%
- CVE-2025-10990: Ruby REXML ReDoS in hex numeric character referenceshighCVSS 7.5EPSS 0.4%
- CVE-2026-42245: Ruby Net::IMAP denial of service in ResponseReaderhighCVSS 7.5EPSS 0.1%
- CVE-2026-42246: Ruby Net::IMAP STARTTLS stripping vulnerabilityhighCVSS 7.4EPSS 0.1%
- CVE-2026-42256: Ruby Net::IMAP computational DoS in SCRAM authenticationmediumCVSS 6.5EPSS 0.1%
- CVE-2026-47242: Ruby Net::IMAP command injection in ID and ENABLE commandsmediumCVSS 5.8
- CVE-2026-47240: Ruby Net::IMAP command injection via non-synchronizing literalsmediumCVSS 5.8
- CVE-2026-80213: Ruby resolv DNS label encoding bypassmediumCVSS 4EPSS 0.4%
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 1 | 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 | 3 | 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/vendors/ruby.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, "Ruby vulnerabilities", https://junglewise.ai/threats/vendors/ruby, 26 September 2026.