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Improper Validation of Syntactic Correctness of Input

🗓️ 02 Apr 2026 18:19:48Reported by Snyk Security DatabaseType 
snyk
 snyk
🔗 security.snyk.io👁 21 Views

Rack::Request validation flaw allows bypass of host allowlist via invalid Host headers.

Related
Detection
Refs
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 security vulnerabilities
2 Apr 202600:00
–cnnvd
cve
CVE
CVE-2026-34835
2 Apr 202617:09
–cve
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
Rows per page
Vulners
Node
OR
rack_projectrackRange3.0.0.beta1–3.1.21
rack_projectrackRange3.2.0–3.2.6

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05 Apr 2026 08:13Current
6Medium risk
Vulners AI Score6
CVSS 3.14.8 - 6.5
CVSS 46.3
EPSS0.00192
SSVC
21