---
id: CVE-2026-105766
title: >-
  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 all…
summary: >-
  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 all…
severity: low
cvss: 3.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N'
cwe:
  - CWE-319
vendor: Chainguard
product: Chainguard Academy (edu)
affected:
  - >-
    academy_edu >= 0b75ff98057f69b044a3e7194e428066ac5ad0d4 <
    93dc0e50739c225f5aee2e803800a47fc0feb906
published: '2026-10-05'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T20:17:20.620'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-105766'
references:
  - url: >-
      https://github.com/chainguard-dev/edu/commit/93dc0e50739c225f5aee2e803800a47fc0feb906
    label: 82cea9a6-e9e3-46fe-bdb0-3673de380178
  - url: 'https://github.com/chainguard-dev/edu/pull/3989'
    label: 82cea9a6-e9e3-46fe-bdb0-3673de380178
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-05T20:32:56.654Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.