CVE-2026-105766
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
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 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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Chainguard | Chainguard Academy (edu) | 0b75ff98057f69b044a3e7194e428066ac5ad0d4 < 93dc0e50739c225f5aee2e803800a47fc0feb906 | affected |
Weaknesses
- CWE-319: CWE-319 Cleartext Transmission of Sensitive Information
References
- https://github.com/chainguard-dev/edu/commit/93dc0e50739c225f5aee2e803800a47fc0feb906
- https://github.com/chainguard-dev/edu/pull/3989
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