CVE-2026-105766 (GCVE-0-2026-105766)
Vulnerability from cvelistv5 – Published: 2026-10-05 19:45 – Updated: 2026-10-06 13:44 Exclusively Hosted Service
VLAI
EPSS
VEX
Title
Chainguard Academy (edu) Nginx directory redirect downgrades HTTPS requests to HTTP
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 13:43 UTC
CWE
- CWE-319 - Cleartext Transmission of Sensitive Information
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Chainguard | Chainguard Academy (edu) |
Affected:
0b75ff98057f69b044a3e7194e428066ac5ad0d4 , < 93dc0e50739c225f5aee2e803800a47fc0feb906
(git)
|
guessed |
Date Public
2026-09-11 16:16
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"value": "\u003cp\u003eFixed in commit 93dc0e50739c225f5aee2e803800a47fc0feb906, which hardcodes the \u003ccode\u003ehttps\u003c/code\u003e scheme in the redirect. The fix is deployed to \u003ccode\u003eedu.chainguard.dev\u003c/code\u003e; no user action is required.\u003c/p\u003e"
}
],
"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."
}
],
"source": {
"discovery": "INTERNAL"
},
"tags": [
"exclusively-hosted-service"
],
"timeline": [
{
"lang": "en",
"time": "2025-07-14T21:34:00.000Z",
"value": "Vulnerable redirect introduced (chainguard-dev/edu#2411)"
},
{
"lang": "en",
"time": "2026-09-11T16:16:00.000Z",
"value": "Fix merged (chainguard-dev/edu#3989)"
}
],
"title": "Chainguard Academy (edu) Nginx directory redirect downgrades HTTPS requests to HTTP",
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"assignerShortName": "chainguard",
"cveId": "CVE-2026-105766",
"datePublished": "2026-10-05T19:45:50.015Z",
"dateReserved": "2026-10-05T19:21:04.930Z",
"dateUpdated": "2026-10-06T13:44:09.303Z",
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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