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CVE-2026-15927

Quay: mirror-registry: ssrf: repo-level mirror accepts external_reference without url validation

Published: Jul 21, 2026Updated: Aug 5, 2026 Sources: CVE List NVDCWE-918
6.8MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 83.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
Not available

Description

A flaw was found in Red Hat Quay's repository-level mirror configuration feature. The POST and PUT handlers in endpoints/api/mirror.py accept an external_reference parameter without SSRF validation, unlike the organization-level mirror handlers which apply validate_external_registry_url(). A repository administrator can supply a crafted hostname that causes the Quay mirror worker to make requests via Skopeo to internal network services, cloud metadata endpoints, or other resources not intended to be reachable from the Quay application.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:CC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-918

Affected Products

Red Hat
commercial·US
Red Hat Quay 3.9SaaSSaaS Service
Cloud & SaaS / saas-application
mirror registry for Red Hat OpenShift 2On-prem
Operating Systems / linux-distro
Red Hat Quay 3On-prem
DevTools & CI / artifact-registry

Exploitability

Workaround Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Command and Control
Initial Access
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2026:50931
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-15927
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2501256
bugzilla.redhat.com

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