{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-105766", "assignerOrgId": "82cea9a6-e9e3-46fe-bdb0-3673de380178", "state": "PUBLISHED", "assignerShortName": "chainguard", "dateReserved": "2026-10-05T19:21:04.930Z", "datePublished": "2026-10-05T19:45:50.015Z", "dateUpdated": "2026-10-05T19:45:50.015Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "82cea9a6-e9e3-46fe-bdb0-3673de380178", "shortName": "chainguard", "dateUpdated": "2026-10-05T19:45:50.015Z"}, "title": "Chainguard Academy (edu) Nginx directory redirect downgrades HTTPS requests to HTTP", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-319", "description": "CWE-319 Cleartext Transmission of Sensitive Information", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-94", "descriptions": [{"lang": "en", "value": "CAPEC-94 Adversary in the Middle (AiTM)"}]}], "affected": [{"vendor": "Chainguard", "product": "Chainguard Academy (edu)", "repo": "https://github.com/chainguard-dev/edu", "modules": ["Nginx trailing-slash directory redirect"], "versions": [{"status": "affected", "version": "0b75ff98057f69b044a3e7194e428066ac5ad0d4", "lessThan": "93dc0e50739c225f5aee2e803800a47fc0feb906", "versionType": "git"}], "defaultStatus": "unaffected", "programFiles": ["nginx.conf"]}], "descriptions": [{"lang": "en", "value": "Use of the backend-facing $scheme variable in the trailing-slash directory redirect in nginx.conf of Chainguard Academy (edu) from commit 0b75ff98057f69b044a3e7194e428066ac5ad0d4 before commit 93dc0e50739c225f5aee2e803800a47fc0feb906 allows an on-path network attacker to read or modify documentation content served to a victim via an HTTPS request for a slashless directory path, because TLS terminates at the load balancer in front of Nginx and the resulting 301 response redirects the client to a plaintext http:// URL. Browsers that ship the HSTS preload list are not affected, because the .dev top-level domain is preloaded; clients that do not enforce HSTS, such as command-line HTTP clients and scripts that follow redirects, are affected.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Use of the backend-facing <code>$scheme</code> variable in the trailing-slash directory redirect in <code>nginx.conf</code> 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 <code>http://</code> URL. Browsers that ship the HSTS preload list are not affected, because the <code>.dev</code> top-level domain is preloaded; clients that do not enforce HSTS, such as command-line HTTP clients and scripts that follow redirects, are affected.</p>"}]}], "references": [{"url": "https://github.com/chainguard-dev/edu/commit/93dc0e50739c225f5aee2e803800a47fc0feb906", "name": "Fix commit 93dc0e5", "tags": ["patch"]}, {"url": "https://github.com/chainguard-dev/edu/pull/3989", "name": "chainguard-dev/edu#3989", "tags": ["patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "LOW", "baseScore": 2.3, "vectorString": "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"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseSeverity": "LOW", "baseScore": 3.1, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"}}], "source": {"discovery": "INTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.5"}, "datePublic": "2026-09-11T16:16:00.000Z", "tags": ["exclusively-hosted-service"], "configurations": [{"lang": "en", "value": "TLS is terminated before requests reach Nginx (as in the production Cloud Run deployment), and the client following the redirect does not enforce HSTS for edu.chainguard.dev.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>TLS is terminated before requests reach Nginx (as in the production Cloud Run deployment), and the client following the redirect does not enforce HSTS for <code>edu.chainguard.dev</code>.</p>"}]}], "solutions": [{"lang": "en", "value": "Fixed in commit 93dc0e50739c225f5aee2e803800a47fc0feb906, which hardcodes the https scheme in the redirect. The fix is deployed to edu.chainguard.dev; no user action is required.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Fixed in commit 93dc0e50739c225f5aee2e803800a47fc0feb906, which hardcodes the <code>https</code> scheme in the redirect. The fix is deployed to <code>edu.chainguard.dev</code>; no user action is required.</p>"}]}], "timeline": [{"time": "2025-07-14T21:34:00.000Z", "lang": "en", "value": "Vulnerable redirect introduced (chainguard-dev/edu#2411)"}, {"time": "2026-09-11T16:16:00.000Z", "lang": "en", "value": "Fix merged (chainguard-dev/edu#3989)"}], "credits": [{"lang": "en", "value": "Matthew Helmke (https://github.com/matthewhelmke)", "type": "remediation developer"}, {"lang": "en", "value": "SunnyR (https://github.com/SunnyR)", "type": "coordinator"}, {"lang": "en", "value": "Chainguard (https://chainguard.dev)", "type": "coordinator"}]}}}

{}

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{}