CVE-2026-32591: A flaw was found in Red Hat Quay's Proxy Cache configuration feature

Routine

MEDIUM 5.2WATCHLISTDOWNGRADEDOWNGRADE

CVE-2026-32591 is a medium-severity flaw (CVSS 5.2) affecting mirror registry for red hat openshift, quay. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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, c

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.2 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-04-08
Last modified	2026-09-22

Publisher (CNA): Red Hat, Inc. · Vendor: redhat

Last updated 2026-09-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-08 18:26 UTCPublished CVE record published
2026-09-22 18:17 UTCUpdated Record last modified

redhat mirror registry for red hat openshift DOWNGRADE

Affected: all versions · 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy mirror-registry-for-red-hat-openshift || rpm -q mirror-registry-for-red-hat-openshift || mirror-registry-for-red-hat-openshift --version

2. No fixed release: DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison mirror-registry-for-red-hat-openshift sudo apt install mirror-registry-for-red-hat-openshift=<VERSION_BEFORE_2.0> sudo apt-mark hold mirror-registry-for-red-hat-openshift

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mirror-registry-for-red-hat-openshift sudo dnf downgrade mirror-registry-for-red-hat-openshift-<VERSION_BEFORE_2.0> sudo dnf versionlock add mirror-registry-for-red-hat-openshift

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat quay DOWNGRADE

Affected: 3.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.0

1. Check installed version

apt-cache policy quay || rpm -q quay || quay --version

2. No fixed release: DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison quay sudo apt install quay=<VERSION_BEFORE_3.0.0> sudo apt-mark hold quay

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list quay sudo dnf downgrade quay-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add quay

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-32591?

mirror registry for red hat openshift: downgrade or apply the listed mitigation; quay: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-32591 being exploited?

CVE-2026-32591 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-32591 affect?

CVE-2026-32591 affects mirror registry for red hat openshift, quay. Severity is medium (CVSS 5.2). 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

How urgent is CVE-2026-32591?

Priority 30/100. On your watchlist

Software pages

Red Hat OpenShift vulnerabilities

Related CVEs

CVE-2026-32589 HIGH 7.4 DOWNGRADE DOWNGRADE A flaw was found in Red Hat Quay's container image upload process
CVE-2026-2377 MEDIUM 6.5 DOWNGRADE DOWNGRADE A flaw was found in Red Hat Quay and mirror registry for Red Hat OpenShift
CVE-2026-32590 HIGH 7.1 DOWNGRADE DOWNGRADE A flaw was found in Red Hat Quay's handling of resumable container image layer uploads
CVE-2025-14243 MEDIUM 5.3 DOWNGRADE A flaw was found in the OpenShift Mirror Registry

References

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