CVE-2026-105766

1th percentile - higher than 1% of all known CVEs

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.

An on-path attacker can intercept or modify HTTP traffic after redirection, exposing or falsifying documentation content. Risk of confidentiality and integrity breach for clients that do not enforce HSTS.

Update the nginx.conf configuration to commit 93dc0e50739c225f5aee2e803800a47fc0feb906 or later. Ensure redirects use https:// instead of $scheme to avoid redirects to unencrypted HTTP.