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Authentication Bypass

🗓️ 14 May 2026 17:21:38Reported by Veracode Vulnerability DatabaseType 
veracode
 veracode
🔗 sca.analysiscenter.veracode.com👁 8 Views

Traefik authentication bypass due to header alias sanitization flaw allowing spoofed headers on protected routes.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-39858
30 Apr 202620:26
attackerkb
AlpineLinux
CVE-2026-39858
30 Apr 202620:26
alpinelinux
Circl
CVE-2026-39858
24 Apr 202613:35
circl
CNNVD
Traefik 安全漏洞
30 Apr 202600:00
cnnvd
CVE
CVE-2026-39858
30 Apr 202620:26
cve
Cvelist
CVE-2026-39858 Traefik: Forwarded alias spoofing top pre-auth decision bypass
30 Apr 202620:26
cvelist
EUVD
EUVD-2026-26427
30 Apr 202620:26
euvd
Github Security Blog
Traefik: Pre-authentication decision bypass due to forwarded alias spoofing
24 Apr 202616:32
github
Tenable Nessus
Traefik < 2.11.43 / 3.x < 3.6.14 Multiple Vulnerabilities
2 May 202600:00
nessus
NVD
CVE-2026-39858
30 Apr 202621:16
nvd
Rows per page
Vulners
Node
traefikgithub.com/traefik/traefikRangev1.0.alpha.0e683cc5355bc507dabac68bbc7559d3f179e1851.0.alpha.0e683cc5355bc507dabac68bbc7559d3f179e185go
OR
traefikgithub.com/traefik/traefikRangev3.7.0-ea.13.7.0-ea.1go
OR
traefikgithub.com/traefik/traefikRangev3.0.0-beta13.0.0-beta1go

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18 May 2026 06:16Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.110
CVSS 47.8
EPSS0.00515
SSVC
8