CVE Tools
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Rack

19 CVEs tracked since 2025. Since Oct 2025, none of them reached CISA KEV.

Rack CVEs per month

Oct 2025 to Apr 2026. Point at a month, or focus the strip and use the arrow keys.
Rack CVEs per month, with the share now in CISA KEV
MonthCVEsIn CISA KEV
2025-1050
2025-11null or fewer
2025-12null or fewer
2026-01null or fewer
2026-02null or fewer
2026-03null or fewer
2026-04140

Products

The products that kept showing up in Rack's monthly top three, with their CVEs summed over those months.

  1. Rack182 months
  2. Rack-session11 month

Latest CVEs

The 15 most recently published vulnerabilities affecting Rack.

  1. CVE-2026-39324Rack::Session::Cookie secrets: decrypt failure fallback enables secretless session forgery and Marshal deserialization9.8
  2. CVE-2026-26962Rack: Header injection in multipart requests4.8
  3. CVE-2026-34835Rack: `Rack::Request` accepts invalid Host characters, enabling host allowlist bypass.4.8
  4. CVE-2026-34827Rack: Algorithmic-Complexity DoS in Rack::Multipart::Parser7.5
  5. CVE-2026-32762Rack: Forwarded Header semicolon injection enables Host and Scheme spoofing4.8
  6. CVE-2026-34830Rack: Rack::Sendfile regex injection via HTTP_X_ACCEL_MAPPING header allows arbitrary file reads through nginx5.9
  7. CVE-2026-34829Rack: Denial of Service via Unbounded Multipart File Upload Without Content-Length7.5
  8. CVE-2026-34826Rack: Unbounded Range Count in get_byte_ranges Enables DoS5.3
  9. CVE-2026-34786Rack: Rack::Static header_rules bypass via URL-encoded paths5.3
  10. CVE-2026-34785Rack: Local file inclusion in `Rack::Static` via URL Prefix Matching7.5
  11. CVE-2026-34763Rack: Rack::Directory info disclosure and DoS via unescaped regex interpolation5.3
  12. CVE-2026-34831Rack: Content-Length mismatch in Rack::Files error responses4.8
  13. CVE-2026-26961Rack: Multipart Boundary Parsing Ambiguity allowing WAF Bypass3.7
  14. CVE-2026-34230Rack: Quadratic complexity in Rack::Utils.select_best_encoding via wildcard Accept-Encoding header5.3
  15. CVE-2026-25500Rack's Stored XSS in Rack::Directory via javascript: filenames rendered into anchor href5.4

The record

Peak rank
#72 in Apr 2026
Busiest month shown
Apr 2026, 14 CVEs
Months with a KEV entry
0 since Oct 2025
Monthly snapshots
2 since 2025
Rack's full record, month by month

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