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CVE-2026-105766— Chainguard Academy (edu) Nginx directory redirect downgrades HTTPS requests to HTTP

Quick assessment

Affected
Chainguard Chainguard Academy (edu)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Chainguard Academy（edu）在 commit 93dc0e50739c225f5aee2e803800a47fc0feb906 之前的代码（自 commit 0b75ff98057f69b044a3e7194e428066ac5ad0d4 起引入）的 nginx.conf 文件中，在后斜杠目录重定向逻辑中使用了面向后端的 变量。该漏洞允许网络路径上的攻击者读取或篡改通过 HTTPS 请求发送给受害者的文档内容，具体当受害者请求一个不带尾随斜杠的目录路径时。由于 TLS 在 Nginx 前面的负载均

CVSS 3.1 · Low

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-105766

Vulnerability Information
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Vulnerability Title
Chainguard Academy (edu) Nginx directory redirect downgrades HTTPS requests to HTTP
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文传输
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Chainguard Chainguard Academy (edu) 0b75ff98057f69b044a3e7194e428066ac5ad0d4 ~ 93dc0e50739c225f5aee2e803800a47fc0feb906 -

II. Public POCs for CVE-2026-105766

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III. Intelligence Information for CVE-2026-105766

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Other References for CVE-2026-105766 (2)

IV. Related Vulnerabilities

Same product: Chainguard Academy (edu)
Same vendor: Chainguard
Same weakness: CWE-319

V. Comments for CVE-2026-105766

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