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Rack::Request accepts invalid Host characters, enabling host allowlist bypass

🗓️ 02 Apr 2026 20:36:40Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 3 Views

Rack::Request parses Host permissively, enabling allowlist bypass with malicious Host values.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-34835
2 Apr 202617:09
attackerkb
Information Security Automation
April Linux Patch Wednesday
22 Apr 202616:00
avleonov
Chainguard
CVE-2026-34835 vulnerabilities
6 Apr 202601:18
cgr
CNNVD
Rack 安全漏洞
2 Apr 202600:00
cnnvd
CVE
CVE-2026-34835
2 Apr 202617:09
cve
Cvelist
CVE-2026-34835 Rack: `Rack::Request` accepts invalid Host characters, enabling host allowlist bypass.
2 Apr 202617:09
cvelist
Debian CVE
CVE-2026-34835
2 Apr 202617:09
debiancve
EUVD
EUVD-2026-18478
2 Apr 202620:36
euvd
NVD
CVE-2026-34835
2 Apr 202618:16
nvd
OSV
CGA-F9QQ-57F2-FFMP
6 Apr 202600:30
osv
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Vulners
Node
rack_projectrackRange3.2.03.2.6rubygems
OR
rack_projectrackRange3.0.0.beta13.1.21rubygems

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13 May 2026 16:19Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.14.8 - 6.5
EPSS0.00152
SSVC
3