CVE-2026-81678
Received Received - Intake

Server-Side Request Forgery in AVideo via IPv6 Transition Address Bypass

Publication date: 2026-08-27

Last updated on: 2026-08-27

Assigner: VulnCheck

Description
AVideo before 24.0 contains a server-side request forgery vulnerability in the isSSRFSafeURL function that fails to extract embedded IPv4 addresses from NAT64, 6to4, and Teredo IPv6 transition address formats. Unauthenticated attackers can bypass SSRF protections via the LiveLinks proxy endpoint to reach internal services and cloud metadata endpoints by encoding private IPv4 targets in transition address formats.

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Meta Information

Published
2026-08-27
Last Modified
2026-08-27
Generated
2026-08-27
AI Q&A
2026-08-27
EPSS Evaluated
N/A
NVD
CVE-2026-81678
EUVD
EUVD-2026-67034

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
avideo avideo to 24.0 (exc)
wwbn avideo to 24.0 (exc)

Helpful Resources

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.

Attack-Flow Graph

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Executive Summary

AVideo before version 24.0 has a server-side request forgery (SSRF) vulnerability in the isSSRFSafeURL function. The flaw allows unauthenticated attackers to bypass SSRF protections by exploiting IPv6 transition address formats like NAT64, 6to4, and Teredo. These formats can encode private IPv4 addresses, enabling access to internal services and cloud metadata endpoints through the LiveLinks proxy endpoint.

Detection Guidance

To detect this vulnerability, inspect AVideo server logs for requests to the LiveLinks proxy endpoint containing IPv6 transition addresses like NAT64, 6to4, or Teredo formats. Check for encoded private IPv4 addresses within these formats. Use network monitoring tools to identify unauthorized internal or cloud metadata service access attempts.

Impact Analysis

Unauthenticated attackers could exploit this to access internal services, cloud metadata, or other restricted resources. This may lead to unauthorized data exfiltration or interaction with internal systems, potentially compromising sensitive data or system integrity.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate compliance requirements under GDPR (data protection) or HIPAA (healthcare data privacy). Organizations using vulnerable AVideo versions may face regulatory penalties or breaches of compliance standards.

Mitigation Strategies

Immediately upgrade AVideo to version 24.0 or later to patch the SSRF flaw. If upgrading is not possible, apply input validation to the LiveLinks proxy endpoint to block IPv6 transition address formats. Restrict access to internal services and cloud metadata endpoints from the AVideo server.

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