CVE-2026-100861
Received Received - Intake

Heym Before 0.0.105 SSRF Bypass via Egress Guard Misconfiguration

Publication date: 2026-09-27

Last updated on: 2026-09-27

Assigner: VulnCheck

Description
heym before 0.0.105 fails to apply egress guards to integration services that use credential-supplied base URLs, allowing authenticated users to bypass SSRF protections. Attackers can configure credentials pointing to loopback, private, or cloud-metadata addresses and read internal service responses returned as workflow node output.

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Meta Information

Published
2026-09-27
Last Modified
2026-09-27
Generated
2026-09-27
AI Q&A
2026-09-27
EPSS Evaluated
N/A
NVD
CVE-2026-100861
EUVD
EUVD-2026-87826

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
heymrun heym to 0.0.105 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
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.

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Executive Summary

This is a Server-Side Request Forgery (SSRF) vulnerability in the heym integration services before version 0.0.105. It occurs because credential-controlled base URLs bypass the egress guard mechanism designed to block requests to non-public addresses. Attackers with authenticated access can configure credentials pointing to loopback, private, or cloud-metadata addresses, allowing them to read internal service responses as workflow node output.

Detection Guidance

Check if heym integration services are using credential-supplied base URLs that point to loopback, private, or cloud-metadata addresses. Review workflow configurations for nodes using credentials to construct HTTP clients. Monitor for unusual internal service responses returned as workflow output.

Impact Analysis

If you use heym integration services before version 0.0.105, an authenticated attacker could exploit this to access internal services or data that should be restricted. This includes reading responses from services like databases, APIs, or cloud metadata endpoints, potentially exposing sensitive information.

Compliance Impact

This vulnerability allows authenticated users to bypass SSRF protections and access internal service responses, which could expose sensitive data. For GDPR, this may violate principles of data protection and confidentiality. For HIPAA, it could lead to unauthorized access to protected health information if internal services handle such data.

Mitigation Strategies

Upgrade heym to version 0.0.105 or later where the fix has been applied. Ensure the egress guard policy is consistently enforced for all credential-derived base URLs. Validate and pin addresses to prevent DNS rebinding and redirect bypasses.

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