{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0b75ff98057f69b044a3e7194e428066ac5ad0d4"
            },
            {
              "fixed": "93dc0e50739c225f5aee2e803800a47fc0feb906"
            }
          ],
          "repo": "https://github.com/chainguard-dev/edu",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "chainguard",
    "cwe_ids": [
      "CWE-319"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105766.json"
  },
  "details": "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.",
  "id": "CVE-2026-105766",
  "modified": "2026-10-08T02:30:39.822217356Z",
  "published": "2026-10-05T19:45:50.015Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105766.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-105766"
    },
    {
      "type": "FIX",
      "url": "https://github.com/chainguard-dev/edu/commit/93dc0e50739c225f5aee2e803800a47fc0feb906"
    },
    {
      "type": "FIX",
      "url": "https://github.com/chainguard-dev/edu/pull/3989"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/chainguard-dev/edu"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Chainguard Academy (edu) Nginx directory redirect downgrades HTTPS requests to HTTP"
}