CVE-2026-13322

Guest-triggered service interruption via unbounded line buffering

Published Jun 26, 2026 · Updated Jun 26, 2026

Resource exhaustion in Red Hat OpenShift Virtualization allows guest OS users to interrupt virt-handler through a configured metrics device. The downward metrics virtio-serial server passes a newline-free guest byte stream to textproto.Reader.ReadLine(), which buffers input without a length limit or read deadline. Access to a VM guest with the downward metrics device configured is required; continued input exhausts virt-handler memory until the process is OOM-killed.

CVSS severity3.8
Low
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Red Hat OpenShift Virtualization allows guest OS users to interrupt virt-handler through a configured metrics device. The downward metrics virtio-serial server passes a newline-free guest byte stream to textproto.Reader.ReadLine(), which buffers input without a length limit or read deadline. Access to a VM guest with the downward metrics device configured is required; continued input exhausts virt-handler memory until the process is OOM-killed.

The record

CVE
CVE-2026-13322
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
389 Directory Server
Product
Red Hat OpenShift Virtualization
Classifications
CWE-770, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

389 Directory Server · Red Hat OpenShift VirtualizationAffected versions are unavailable in this record.

Published CVSS scores

3.8Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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