SSRF in Red Hat Mirror Registry For Openshift 2
CVE-2026-15927
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.006 (47.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001
Affected products
- Red Hat Mirror Registry For Openshift 2
- Red Hat Quay 3
- Red Hat Quay 3.1 — versions 1786395065
- Red Hat Quay 3.10 — versions 1786395065
- Red Hat Quay 3.12 — versions 1786170635
- Red Hat Quay 3.17 — versions 1786181981
- Red Hat Quay 3.9 — versions 1785950004
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-15927 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- access.redhat.com/errata/RHSA-2026:50931 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:52968 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:53520 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:54395 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:63307 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:69255 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:70267 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-15927?
- CVE-2026-15927 is a medium-severity vulnerability in Red Hat Mirror Registry For Openshift 2, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.8/10. Published 2026-07-21.
- How severe is CVE-2026-15927?
- Medium severity. CVSS v3 base score is 6.8 out of 10.