Caddy: FastCGI header normalization bypass in `forward_auth copy_headers`

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-52845 · Microsoft / collected KEV context

EUVD-2026-38558

GHSA-f59h-q822-g45g

GO-2026-5346

cve-program · CVE-2026-52845

• https://github.com/caddyserver/caddy/security/advisories/GHSA-f59h-q822-g45g

euvd · EUVD-2026-38558

• https://github.com/caddyserver/caddy/security/advisories/GHSA-f59h-q822-g45g

nvd · CVE-2026-52845

• https://github.com/caddyserver/caddy/security/advisories/GHSA-f59h-q822-g45g
• https://access.redhat.com/security/cve/CVE-2026-52845
• https://bugzilla.redhat.com/show_bug.cgi?id=2491907
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52845.json

osv · GHSA-f59h-q822-g45g

• https://github.com/caddyserver/caddy/security/advisories/GHSA-f59h-q822-g45g
• https://nvd.nist.gov/vuln/detail/CVE-2026-52845
• https://access.redhat.com/security/cve/CVE-2026-52845
• https://bugzilla.redhat.com/show_bug.cgi?id=2491907
• https://github.com/caddyserver/caddy
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52845.json

osv · GO-2026-5346

• https://github.com/caddyserver/caddy/security/advisories/GHSA-f59h-q822-g45g
• https://github.com/caddyserver/caddy/pull/7633

No related operational record is retained in the current change model.