Skip to content
Fencer Vulns
low 3.8

CVE-2026-13322 json

Kubevirt: virt-handler-rhel9: kubevirt: unbounded virtio-serial readline in virt-handler causes oom denial of service

published 2026-06-26 4 mo ago modified 2026-11-05 3 d ago also GHSA-6f2p-2qg2-qqch , GO-2026-6912 , EUVD-2026-39599

cvss
3.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-13322 updated cvss 3.8

kubevirt: virt-handler-rhel9: kubevirt: unbounded virtio-serial ReadLine in virt-handler causes OOM denial of service

  • Red Hat OpenShift Virtualization 4 container-native-virtualization/virt-handler, container-native-virtualization/virt-handler-rhel9
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
GitHub 3.1 3.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
go github.com/kubevirt/kubevirt
>=1.1.0-alpha.0, <=1.10.0-rc.0
 no fix listed
go kubevirt.io/kubevirt
>=1.1.0-alpha.0
 no fix listed

Affected products

  • Red Hat Red Hat OpenShift Virtualization 4

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.