CVE-2026-15927
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().
Does this matter?
Lower severity and a low EPSS score (0.51%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.8 MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
- EPSS
- 0.51% probability · 42th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-918
- Source
- secalert@redhat.com
References
- https://access.redhat.com/errata/RHSA-2026:50931
- https://access.redhat.com/errata/RHSA-2026:52968
- https://access.redhat.com/errata/RHSA-2026:53520
- https://access.redhat.com/errata/RHSA-2026:54395
- https://access.redhat.com/errata/RHSA-2026:63307
- https://access.redhat.com/security/cve/CVE-2026-15927
- https://bugzilla.redhat.com/show_bug.cgi?id=2501256
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.