SSRF Vulnerability in Red Hat Quay Notification Webhook

Executive Summary

CVE-2026-16910 is a Server-Side Request Forgery (SSRF) vulnerability in Red Hat Quay's notification webhook feature. It allows a repository administrator to craft malicious notifications with URLs pointing to internal network addresses or cloud infrastructure endpoints. When triggered, the Quay worker performs POST requests to these attacker-specified URLs without proper SSRF validation, enabling blind SSRF from the worker's network context.

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Detection Guidance

To detect this vulnerability, monitor network traffic from Quay workers for unexpected POST requests to internal or cloud infrastructure addresses. Check logs for notifications with delivery URLs pointing to private IPs, localhost, or cloud metadata endpoints. Review notification configurations in Red Hat Quay for unauthorized Slack or generic webhook URLs.

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Impact Analysis

This vulnerability allows an attacker with repository administrator privileges to access internal network resources or cloud metadata endpoints that should be unreachable from the application. It could lead to unauthorized data exfiltration, internal service probing, or further network pivoting attacks from the Quay worker's network context.

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Mitigation Strategies

Apply the latest Red Hat Quay patches to enable SSRF validation for notification webhooks. Update the HOSTNAME_BLACKLIST to include broader private IP ranges and cloud metadata hostnames. Restrict repository administrator privileges to prevent unauthorized notification creation. Monitor for suspicious POST requests from Quay workers.

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