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Description

A flaw was found in KubeVirt's downward metrics virtio-serial server. The server reads guest requests using textproto.Reader.ReadLine(), which buffers input indefinitely until a newline character is received, with no length limit or read deadline. A user with access to a VM guest that has the downward metrics virtio-serial device configured can write a continuous byte stream to the device, causing unbounded memory allocation in the virt-handler process until it is OOM-killed.

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




LOW: 3.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L

Problem types

Allocation of Resources Without Limits or Throttling

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-2026-13322 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2492681 (RHBZ#2492681) issue-tracking

cve.org (CVE-2026-13322)

nvd.nist.gov (CVE-2026-13322)

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