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CVE-2026-34835

🗓️ 02 Apr 2026 17:09:07Reported by GitHub_MType 
cve
 cve
🔗 web.nvd.nist.gov👁 107 Views🌐 WEB

Rack::Request accepts invalid Host chars, bypassing allowlists and enabling host header poisoning.

Related
Detection
Affected
Refs
Paths
ReporterTitlePublishedViews
Family
githubexploit
GithubExploit
Exploit for Improper Validation of Syntactic Correctness of Input in Rack
3 Jul 202602:50
–githubexploit
attackerkb
attackerkb
CVE-2026-34835
2 Apr 202617:09
–attackerkb
avleonov
Information Security Automation
April Linux Patch Wednesday
22 Apr 202616:00
–avleonov
bdu_fstec
BDU FSTEC
Rack Request Bypass
6 Jul 202600:00
–bdu_fstec
cgr
Chainguard
CVE-2026-34835 vulnerabilities
6 Apr 202601:18
–cgr
circl
Circl
CVE-2026-34835
14 Jul 202601:00
–circl
cnnvd
CNNVD
Rack 安全漏洞
2 Apr 202600:00
–cnnvd
cvelist
Cvelist
CVE-2026-34835 Rack: `Rack::Request` accepts invalid Host characters, enabling host allowlist bypass.
2 Apr 202617:09
–cvelist
debian
Debian
[SECURITY] [DSA 6492-1] ruby-rack security update
10 Sep 202620:35
–debian
debiancve
Debian CVE
CVE-2026-34835
2 Apr 202617:09
–debiancve
Rows per page
NVD
Vulners
Node
OR
rackrackRange3.0.0–3.1.21ruby
rackrackRange3.2.0–3.2.6ruby
[
  {
    "vendor": "rack",
    "product": "rack",
    "versions": [
      {
        "version": ">= 3.0.0.beta1, < 3.1.21",
        "status": "affected"
      },
      {
        "version": ">= 3.2.0, < 3.2.6",
        "status": "affected"
      }
    ]
  }
]
ParameterPositionPathDescriptionCWE
Hostheader/Rack::Request parsing may accept non-RFC characters in the Host header, enabling host header bypass when downstream validation relies on prefix/suffix checks.CWE-1286

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24 Jul 2026 21:10Current
6Medium risk
Vulners AI Score6
CVSS 3.14.8 - 6.5
EPSS0.00278
SSVC
107