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Description

A server-side request forgery (SSRF) flaw was found in KubeVirt's virt-api port-forward handler. When processing a port-forward request to a VirtualMachineInstance (VMI), virt-api reads the target IP from vmi.Status.Interfaces[0].IP and passes it directly to net.Dial() without validation. For VMIs using non-masquerade network bindings (bridge or secondary-only), this IP is reported by the QEMU guest agent running inside the VM and is fully controllable by the VM owner. An attacker with kubevirt.io:edit permissions can create a VM with a modified guest agent that reports an arbitrary IP address, then request port-forward to establish a bidirectional TCP tunnel from virt-api's cluster-internal network position to any routable destination, bypassing NetworkPolicy isolation.

PUBLISHED Reserved 2026-06-25 | Published 2026-06-25 | Updated 2026-06-26 | Assigner redhat




MEDIUM: 6.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Problem types

Server-Side Request Forgery (SSRF)

Product status

Default status
affected

Default status
affected

Timeline

2026-06-25:Reported to Red Hat.
2026-06-25:Made public.

Credits

This issue was discovered by Huzaifa Sidhpurwala (Red Hat).

References

access.redhat.com/security/cve/CVE-2026-13318 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2492659 (RHBZ#2492659) issue-tracking

cve.org (CVE-2026-13318)

nvd.nist.gov (CVE-2026-13318)

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