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CVE-2026-39858

🗓️ 30 Apr 2026 20:26:26Reported by GitHub_MType 
cve
 cve
🔗 web.nvd.nist.gov👁 74 Views

Traefik authentication can be bypassed via forwarded alias headers with underscores not sanitized.

Related
Detection
Affected
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
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
OPENSUSE Linux
traefik-3.6.15-1.1 on GA media (moderate)
7 May 202600:00
opensuse
Rows per page
NVD
Vulners
Node
traefiktraefikRange<2.11.43
OR
traefiktraefikRange3.0.03.6.14
OR
traefiktraefikMatch3.7.0ea1
OR
traefiktraefikMatch3.7.0ea2
OR
traefiktraefikMatch3.7.0ea3
OR
traefiktraefikMatch3.7.0rc1
[
  {
    "vendor": "traefik",
    "product": "traefik",
    "versions": [
      {
        "version": "< 2.11.43",
        "status": "affected"
      },
      {
        "version": ">= 3.0.0-beta1, < 3.6.14",
        "status": "affected"
      },
      {
        "version": ">= 3.7.0-ea.1, < 3.7.0-rc.2",
        "status": "affected"
      }
    ]
  }
]

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17 Jun 2026 10:42Current
5.3Medium risk
Vulners AI Score5.3
CVSS 3.110
CVSS 47.8
EPSS0.00515
SSVC
74