Medium [CVE-2026-16910] SSRF in Red Hat Quay notification webhooks (Slack/generic)
This medium-severity Red Hat Linux advisory covers CVE-2026-16910 affecting Red Hat OpenShift Update Service, Red Hat Quay 3.
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Summary
A flaw was found in Red Hat Quay's notification webhook feature.
The Slack and generic webhook notification handlers accept user-supplied URLs without SSRF validation, allowing a repository administrator to make the Quay worker issue POST requests to internal network addresses or cloud infrastructure endpoints that should not be reachable from the application.
The Quay worker issues requests to attacker-specified URLs when notifications fire, but response data is not returned to the attacker, limiting exploitable impact to network probing and unauthenticated side-effects on internal services. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N).
Weakness: CWE-918. Affected Red Hat products: Red Hat OpenShift Update Service; Red Hat Quay 3.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
Mitigation checklist
- Restrict network egress from Quay worker pods/containers using network policies or firewall rules to block outbound connections to internal network ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) and cloud metadata endpoints (169.254.169.254). Limit repository creation and admin privileges to trusted users. Configure WEBHOOK_HOSTNAME_BLACKLIST in Quay config to include known internal hostnames and IP ranges.
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
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