CVE-2026-32591: Mirror-registry: quay: server-side request forgery in proxy cache upstream registry configuration

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-08 · updated 2026-11-01
Weakness: CWE-918

Description

A flaw was found in Red Hat Quay's Proxy Cache configuration feature. When an organization administrator configures an upstream registry for proxy caching, Quay makes a network connection to the specified registry hostname without verifying that it points to a legitimate external service. An attacker with organization administrator privileges could supply a crafted hostname to force the Quay server to make requests to internal network services, cloud infrastructure endpoints, or other resources that should not be accessible from the Quay application.

Affected products

RedHat Mirror Registry For Red Hat Openshift: 2.0
Red Hat Quay 3: 3.0.0
Red Hat mirror registry for Red Hat OpenShift: all versions
Red Hat mirror registry for Red Hat OpenShift 2: all versions
Red Hat Quay 3.10: all versions — fixed in 1783750447
Red Hat Quay 3.12: all versions — fixed in 1783751865
Red Hat Quay 3.14: all versions — fixed in 1788593843
Red Hat Quay 3.15: all versions — fixed in 1784351966
Red Hat Quay 3.16: all versions — fixed in 1783955846
Red Hat Quay 3.17: all versions — fixed in 1780604033
Red Hat Quay 3.18: all versions — fixed in 1784987273
Red Hat Quay 3.9: all versions — fixed in 1784125838

How to fix

Upgrade to a fixed version: Red Hat Quay 3.10 1783750447; Red Hat Quay 3.12 1783751865; Red Hat Quay 3.14 1788593843; Red Hat Quay 3.15 1784351966; Red Hat Quay 3.16 1783955846; Red Hat Quay 3.17 1780604033; Red Hat Quay 3.18 1784987273; Red Hat Quay 3.9 1784125838. Check the vendor advisory for mitigations.

References

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