CVE-2026-74243: A flaw was found in Red Hat Quay

This month

MEDIUM 6.5REMOTEWATCHLISTMITIGATEDOWNGRADE

CVE-2026-74243 is a medium-severity flaw (CVSS 6.5) affecting openshift update service, 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. When the SECURITY_SCANNER_V4_PSK (pre-shared key) is not set, a remote unauthenticated attacker can send POST requests to the security scanner notification endpoint. This allows the attacker to flood the notification queue and inject path traversal characters into Clair API URL paths. The primary consequence is worker resource exhaustion and blind path manipulation on the configured Clair host, potentially leadin

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-306
Published	2026-08-14
Last modified	2026-08-20

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

Last updated 2026-08-20 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-14 23:16 UTCPublished CVE record published
2026-08-20 19:49 UTCUpdated Record last modified

redhat openshift update service MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy openshift-update-service || rpm -q openshift-update-service || openshift-update-service --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2026-74243?

openshift update service: mitigate or apply the listed mitigation; quay: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-74243 being exploited?

CVE-2026-74243 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-2026-74243 affect?

CVE-2026-74243 affects openshift update service, quay. Severity is medium (CVSS 6.5). A flaw was found in Red Hat Quay. When the SECURITY_SCANNER_V4_PSK (pre-shared key) is not set, a remote unauthenticated attacker can send POST requests to the security scanner notification endpoint. This allows the attacker to flood the no

How urgent is CVE-2026-74243?

Priority 43/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

Red Hat OpenShift vulnerabilities

Related CVEs

CVE-2026-74245 MEDIUM 5.9 MITIGATE DOWNGRADE A flaw was found in Red Hat Quay's exported logs feature
CVE-2026-74244 MEDIUM 5.9 MITIGATE DOWNGRADE A flaw was found in Red Hat Quay's Stripe billing webhook handler
CVE-2026-74247 MEDIUM 4.2 MITIGATE DOWNGRADE A flaw was found in Red Hat Quay
CVE-2026-74240 MEDIUM 5.4 MITIGATE DOWNGRADE A flaw was found in Red Hat Quay's JWT (JSON Web Token) validation for federated robot accounts and single sig
CVE-2026-74241 MEDIUM 4.8 MITIGATE DOWNGRADE A flaw was found in Red Hat Quay's external Lightweight Directory Access Protocol (LDAP) authentication handli

References

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