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Response snapshot Nov 4, 2026, 23:06 UTC

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VulnerabilityCVE-2026-13322

KubeVirt downward metrics virtio-serial server vulnerable to unbounded memory consumption

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.

At a glance

Exploited
Not known
Severity
3.8 Low (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

Consult the exact GitHub advisory for affected versions, mitigation, and patch availability.

Read GitHub-reviewed advisory GHSA-6f2p-2qg2-qqch (opens a new tab)

What happened

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.

Affected package ranges reported by GitHub: github.com/kubevirt/kubevirt: >= 1.1.0-alpha.0, <= 1.10.0-rc.0

Scores and how they were measured

CVSS base severity

3.8

Version 3.1As of

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

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-6f2p-2qg2-qqch (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-6f2p-2qg2-qqch, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, November 4). KubeVirt downward metrics virtio-serial server vulnerable to unbounded memory consumption (CVE-2026-13322). https://kevwire.com/record/CVE-2026-13322

MLA

"KubeVirt downward metrics virtio-serial server vulnerable to unbounded memory consumption (CVE-2026-13322)." KEVWire, 4 Nov. 2026, kevwire.com/record/CVE-2026-13322.

Chicago

KEVWire. "KubeVirt downward metrics virtio-serial server vulnerable to unbounded memory consumption (CVE-2026-13322)." Last modified November 4, 2026. https://kevwire.com/record/CVE-2026-13322.

Evidence summary (plain text)

KubeVirt downward metrics virtio-serial server vulnerable to unbounded memory consumption (Jun 26, 2026).
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.
CVSS 3.8 (version 3.1; evidence as of Nov 4, 2026; https://github.com/advisories/GHSA-6f2p-2qg2-qqch).
Sources:
GitHub-reviewed advisory GHSA-6f2p-2qg2-qqch: https://github.com/advisories/GHSA-6f2p-2qg2-qqch
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-13322.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Nov 4, 2026, 23:05 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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Record details

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