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Rack has Content-Length mismatch in Rack::Files error responses

🗓️ 02 Apr 2026 20:36:10Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 9 Views

Rack::Files uses string size, not bytesize, for Content-Length in 404s with multibyte characters.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-34831
2 Apr 202616:43
attackerkb
Chainguard
CVE-2026-34831 vulnerabilities
6 Apr 202601:18
cgr
CNNVD
Rack 安全漏洞
2 Apr 202600:00
cnnvd
CVE
CVE-2026-34831
2 Apr 202616:43
cve
Cvelist
CVE-2026-34831 Rack: Content-Length mismatch in Rack::Files error responses
2 Apr 202616:43
cvelist
Debian CVE
CVE-2026-34831
2 Apr 202616:43
debiancve
EUVD
EUVD-2026-18392
2 Apr 202620:36
euvd
Mageia
Updated ruby-rack packages fix security vulnerabilities
18 Jun 202621:28
mageia
NVD
CVE-2026-34831
2 Apr 202617:16
nvd
OSV
CGA-WHH4-HGX9-244X
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
OR
rack_projectrackRange<2.2.23rubygems

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13 May 2026 16:19Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.14.8 - 6.5
EPSS0.00147
SSVC
9