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CVE-2026-105766

Chainguard Academy (edu) Nginx directory redirect downgrades HTTPS requests to HTTP

CVSS 4.0 2.3 LOWCVSS 3.1 3.1 LOWCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-105766

Published

Use of the backend-facing $scheme variable in the trailing-slash directory redirect in nginx.conf of Chainguard Academy (edu) from commit 0b75ff98057f69b044a3e7194e428066ac5ad0d4 before commit 93dc0e50739c225f5aee2e803800a47fc0feb906 allows an on-path network attacker to read or modify documentation content served to a victim via an HTTPS request for a slashless directory path, because TLS terminates at the load balancer in front of Nginx and the resulting 301 response redirects the client to a plaintext http:// URL. Browsers that ship the HSTS preload list are not affected, because the .dev top-level domain is preloaded; clients that do not enforce HSTS, such as command-line HTTP clients and scripts that follow redirects, are affected.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-105766

Published

Chainguard Academy (edu)

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Chainguard",
                    "product": "Chainguard Academy (edu)",
                    "repo": "https://github.com/chainguard-dev/edu",
                    "modules": [
                        "Nginx trailing-slash directory redirect"
                    ],
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0b75ff98057f69b044a3e7194e428066ac5ad0d4",
                            "lessThan": "93dc0e50739c225f5aee2e803800a47fc0feb906",
                            "versionType": "git"
                        }
                    ],
                    "defaultStatus": "unaffected",
                    "programFiles": [
                        "nginx.conf"
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON