Red Hat Security Advisory: Technical preview of the satellite/iop-vmaas-rhel9 container image
🔗 CVE IDs covered (3)
📋 Description
CVE-2026-33811 — net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME CVE-2026-39821 — golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing CVE-2026-42561 — python-multipart: python-multipart: Denial of Service via excessive multipart part headers
🎯 Affected products2
- Red Hat Satellite 6.19
- registry.redhat.io/satellite/iop-vmaas-rhel9@sha256:c5674748f760874d42a46d918ce7bb9f39c6beb2607b6644ba490e6c7712ae5f_amd64 as a component of Red Hat Satellite 6.19
✅ Remediation
For Red Hat Lightspeed in Satellite installation see the Red Hat Satellite documentation. Workaround: To mitigate this issue, applications can be configured to use the pure Go DNS resolver instead of the `cgo` DNS resolver. This can be achieved by setting the `GODEBUG` environment variable to `netdns=go`. For example, to run a Go application with this mitigation: `GODEBUG=netdns=go /path/to/your/go/application`. This change may require restarting affected applications or services to take effect. Users should verify that this change does not negatively impact DNS resolution for their specific application environment. Workaround: Upgrade to a fixed golang.org/x/net release that includes the idna correction, via updated golang or dependent package rebuilds.
🔗 References (10)
- selfhttps://access.redhat.com/errata/RHSA-2026:51194
- externalhttps://access.redhat.com/documentation/en-us/red_hat_satellite/6.19/html/updating_red_hat_satellite/index
- externalhttps://access.redhat.com/security/cve/CVE-2026-33811
- externalhttps://access.redhat.com/security/cve/CVE-2026-39821
- externalhttps://access.redhat.com/security/cve/CVE-2026-42561
- externalhttps://access.redhat.com/security/updates/classification/
- externalhttps://catalog.redhat.com/software/containers/search
- externalhttps://docs.redhat.com/en/documentation/red_hat_satellite/6.19/html/installing_satellite_server_in_a_connected_network_environment/performing-additional-configuration-on-server_satellite#installing-and-configuring-red-hat-lightspeed-in-satellite
- externalhttps://docs.redhat.com/en/documentation/red_hat_satellite/6.19/html/installing_satellite_server_in_a_disconnected_network_environment/performing-additional-configuration#installing-and-configuring-red-hat-lightspeed-in-satellite
- selfhttps://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_51194.json