CVE-2026-85471
Quay: quay: webhook notification ssrf -- hostname-string blocklist trivially bypassable
What happened?
A flaw was found in Quay. An authenticated repository administrator could bypass the hostname blacklist in webhook notifications, leading to a Server-Side Request Forgery (SSRF) vulnerability. This allows the Quay application to be tricked into sending requests to internal network resources, such as cloud metadata services or other services within the cluster. Consequently, this could lead to the disclosure of sensitive information from these internal services.
Affected software and versions
| Software | Version information | Fixed version |
|---|---|---|
| openshift/mirror-registry-rhel8Red Hat | Default status: affected | See vendor advisory |
| openshift/mirror-registry-rhel8Red Hat | Default status: affected | See vendor advisory |
| quay/quay-rhel8Red Hat | Default status: affected | See vendor advisory |
| quay/quay-rhel9Red Hat | Default status: affected | See vendor advisory |
Version information comes from the source record and can include unaffected products and exceptions. Distribution packages may contain backported fixes: an older upstream version alone does not prove a server is affected.
Is it being exploited?
This CVE was not listed in the CISA catalogue at our last retrieval. This does not establish that exploitation is absent.
How to respond
- Confirm the product, installed package version, and any configuration requirements in the vendor advisory.
- Follow the vendor’s remediation or workaround guidance in the references below. Structured fixed-version data is unavailable here; the publisher’s description may include a fix or workaround.
- Restart affected services if required, then verify the running version. Known exploitation may warrant investigation as well as patching.