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Caddy: FastCGI header normalization bypass in `forward_auth copy_headers`

🗓️ 16 Jun 2026 21:28:28Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 10 Views

Caddy bypass: forward_auth delete misses underscore alias; CGI normalization collides in FastCGI.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
FreeBSD
caddy -- multiple vulnerabilities
8 Jun 202600:00
freebsd
ATTACKERKB
CVE-2026-52845
23 Jun 202617:52
attackerkb
Circl
CVE-2026-52845
8 Jun 202622:25
circl
CVE
CVE-2026-52845
23 Jun 202617:52
cve
Cvelist
CVE-2026-52845 Caddy: FastCGI header normalization bypass in `forward_auth copy_headers`
23 Jun 202617:52
cvelist
Debian CVE
CVE-2026-52845
23 Jun 202617:52
debiancve
EUVD
EUVD-2026-38558
23 Jun 202617:52
euvd
Tenable Nessus
FreeBSD : caddy -- multiple vulnerabilities (94f93681-6775-11f1-8044-002590af0794)
14 Jun 202600:00
nessus
Tenable Nessus
Linux Distros Unpatched Vulnerability : CVE-2026-52845
24 Jun 202600:00
nessus
NVD
CVE-2026-52845
23 Jun 202618:18
nvd
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Vulners
Node
caddyservercaddyRange1.0.5go
OR
caddyservercaddyRange<2.11.4go

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