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MEDIUM

CVE-2026-15927

CVSS v3

6.8

MEDIUM

EPSS Score

0.6 %

exploit probability, as of 2026-10-17

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-15927 Red Hat Product Security25 products fixed · 1 known affected

    quay: mirror-registry: SSRF: repo-level mirror accepts external_reference without URL validation

    openshift/mirror-registry-rhel8 as a component of mirror registry for Red Hat OpenShift 2

  • RHSA-2026:70267 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Quay 3.14.9

  • RHSA-2026:69255 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Quay 3.16.6

  • RHSA-2026:63307 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Quay 3.15.8

  • RHSA-2026:54395 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Quay 3.17.4

  • RHSA-2026:53520 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Quay 3.10.25

2 more advisories

Full record on NVD

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Published
2026-07-21
Last Modified
2026-07-21

Frequently asked questions

What is 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.

Is CVE-2026-15927 actively exploited?

Active exploitation of CVE-2026-15927 has not been confirmed. Its EPSS score was 0.6% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-15927?

CVE-2026-15927 has a CVSS v3 base score of 6.8 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N.

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