CVE-2026-16637

Received Received - Intake

OPeNDAP Hyrax SSRF and Credential Disclosure via Redirects

Publication date: 2026-08-07

Last updated on: 2026-08-10

Assigner: CERT/CC

Description

OPeNDAP Hyrax allows SSRF and credential disclosure via unvalidated HTTP redirects that bypass the AllowedHosts allowlist and leak Earthdata headers (User-Id, Echo-Token) to attacker-controlled endpoints.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-07

Last Modified

2026-08-10

Generated

2026-08-28

AI Q&A

2026-08-07

EPSS Evaluated

2026-08-26

NVD

CVE-2026-16637

EUVD

EUVD-2026-54479

Affected Vendors & Products

Vendor	Product	Version / Range
opendap	hyrax	1.18.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-201	The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor.
CWE-918	The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

Executive Summary

CVE-2026-16637 is a vulnerability in OPeNDAP Hyrax that allows Server Side Request Forgery (SSRF) and credential disclosure. The flaw occurs because Hyrax follows unvalidated HTTP redirects without checking if the destination is on the allowed hosts list. This lets attackers access internal systems or leak authentication tokens like Earthdata headers (User-Id, Echo-Token) to attacker-controlled endpoints.

Detection Guidance

To detect this vulnerability, monitor HTTP redirects in Hyrax logs for unauthorized external endpoints. Check for leaked headers like User-Id or Echo-Token in network traffic. Verify if redirects bypass the AllowedHosts allowlist by inspecting server configurations and access logs for unexpected external requests.

Impact Analysis

An unauthenticated attacker could exploit this to access internal services or obtain a user's Earthdata identifier and reusable credentials. This may allow unauthorized access to protected datasets. The vulnerability was fixed in Hyrax version 1.18.0.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data and credential leaks, which may violate compliance requirements under GDPR (data protection) and HIPAA (health data privacy). Unauthorized access to authentication tokens or user identifiers risks exposing protected personal or health information.

Mitigation Strategies

Immediately upgrade to Hyrax version 1.18.0 or later to address the vulnerability. Review and tighten the AllowedHosts allowlist configuration to prevent unauthorized redirects. Monitor network traffic for suspicious external requests and leaked authentication tokens.

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