Vendor
Rack vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 17 vulnerabilities in Rack: 2 in the last 7 days and 2 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-125111, was published on 9 November 2026. Nothing was published in the last eight weeks.
- Last 7 days
- 2
- Last 90 days
- 2
- Critical, all time
- 1
- Exploited in the wild
- 0
About Rack
Ruby web application framework for building web services.
Latest Rack vulnerabilities
- CVE-2026-125111: Rack multipart parser denial of service via unbounded scan buffer growthhighCVSS 7.5EPSS 0.4%
- CVE-2026-125109: Rack host validation bypass via HTTP headersmediumCVSS 4.8EPSS 0.2%
- CVE-2026-39324: Rack rack-session auth bypass and deserialization in Session CookiecriticalCVSS 9.8EPSS 0.3%
- CVE-2026-34835: Rack Rack::Request host allowlist bypass via Host header poisoningmediumCVSS 4.8EPSS 0.3%
- CVE-2026-34827: Rack algorithmic complexity denial of service in Multipart ParserhighCVSS 7.5EPSS 0.7%
- CVE-2026-32762: Rack interpretation conflict in Forwarded header parsingmediumCVSS 4.8EPSS 0.3%
- CVE-2026-26962: Rack CRLF injection in Rack::Multipart::ParsermediumCVSS 4.8EPSS 0.3%
- CVE-2026-34831: Rack incorrect Content-Length calculation in Rack::Files error responsesmediumCVSS 4.8EPSS 0.3%
- CVE-2026-34830: Rack Rack regular expression injection in Rack::SendfilemediumCVSS 5.9EPSS 0.4%
- CVE-2026-34829: Rack uncontrolled resource consumption in Rack::Multipart::ParserhighCVSS 7.5EPSS 0.7%
- CVE-2026-34826: Rack denial of service via excessive overlapping HTTP byte rangesmediumCVSS 5.3EPSS 0.5%
- CVE-2026-34786: Rack Rack::Static security header bypass via URL-encoded pathsmediumCVSS 5.3EPSS 0.3%
- CVE-2026-34785: Rack Rack::Static information disclosure via partial string matchinghighCVSS 7.5EPSS 0.5%
- CVE-2026-34763: Rack Rack::Directory information disclosure via unescaped regex interpolationmediumCVSS 5.3EPSS 0.3%
- CVE-2026-34230: Rack inefficient algorithmic complexity in Rack::Utils.select_best_encodinghighCVSS 7.5EPSS 0.5%
- CVE-2026-26961: Rack interpretation conflict in Multipart Parser boundary extractionmediumCVSS 5.3EPSS 0.3%
- CVE-2026-22860: Rack directory traversal in Rack::DirectoryhighCVSS 7.5EPSS 0.7%
Most severe Rack vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-39324: Rack rack-session auth bypass and deserialization in Session CookiecriticalCVSS 9.8EPSS 0.3%
- CVE-2026-22860: Rack directory traversal in Rack::DirectoryhighCVSS 7.5EPSS 0.7%
- CVE-2026-34827: Rack algorithmic complexity denial of service in Multipart ParserhighCVSS 7.5EPSS 0.7%
- CVE-2026-34829: Rack uncontrolled resource consumption in Rack::Multipart::ParserhighCVSS 7.5EPSS 0.7%
- CVE-2026-34785: Rack Rack::Static information disclosure via partial string matchinghighCVSS 7.5EPSS 0.5%
- CVE-2026-34230: Rack inefficient algorithmic complexity in Rack::Utils.select_best_encodinghighCVSS 7.5EPSS 0.5%
- CVE-2026-125111: Rack multipart parser denial of service via unbounded scan buffer growthhighCVSS 7.5EPSS 0.4%
- CVE-2026-34830: Rack Rack regular expression injection in Rack::SendfilemediumCVSS 5.9EPSS 0.4%
- CVE-2026-34826: Rack denial of service via excessive overlapping HTTP byte rangesmediumCVSS 5.3EPSS 0.5%
- CVE-2026-34786: Rack Rack::Static security header bypass via URL-encoded pathsmediumCVSS 5.3EPSS 0.3%
Vulnerabilities per week
Nothing was published in the last eight weeks. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 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 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 2 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many Rack vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/vendors/rack)<a href="https://junglewise.ai/threats/vendors/rack"><img src="https://junglewise.ai/threats/vendors/rack/badge.svg" alt="Rack vulnerabilities" /></a>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/rack.json, and this page as text at https://junglewise.ai/threats/vendors/rack.md, 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, "Rack vulnerabilities", https://junglewise.ai/threats/vendors/rack, 12 November 2026.