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

Advisory record · `GHSA-6f2p-2qg2-qqch`

- **Identifiers:** `GHSA-6f2p-2qg2-qqch` · `CVE-2026-13322` · `GO-2026-6912`
- **State:** Confirmed
- **Severity:** CVSS 3.8 Low
- **Critical:** No
- **Weakness (CWE):** [CWE-770](https://cwe.mitre.org/data/definitions/770.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 26 Jun 2026
- **Updated:** 5 Nov 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 26 Jun 2026, 00:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `github.com/kubevirt/kubevirt` (Go): affected `>=1.1.0-alpha.0, <=1.10.0-rc.0`; no fixed version yet

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> KubeVirt's downward metrics virtio-serial server is vulnerable to unbounded memory consumption in the range 1.1.0-alpha.0 through 1.10.0-rc.0. A user with access to a VM guest that has the downward metrics virtio-serial device configured can send a continuous stream of bytes without a newline, causing virt-handler to allocate memory until it is killed by the out-of-memory killer. The source lists no fixed version.

Written 15 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 3.8 Low, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L`, from CNA (redhat)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0013, the 3rd percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 26 Jun 2026, 00:32 UTC: [Confirmed by GitHub Advisory Database](https://github.com/advisories/GHSA-6f2p-2qg2-qqch)
- 4 Nov 2026, 17:30 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-6f2p-2qg2-qqch)

## Sources

- [GitHub Advisory Database: GHSA-6f2p-2qg2-qqch](https://github.com/advisories/GHSA-6f2p-2qg2-qqch)
- [OSV: GHSA-6f2p-2qg2-qqch](https://osv.dev/vulnerability/GHSA-6f2p-2qg2-qqch)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-13322>
- <https://access.redhat.com/security/cve/CVE-2026-13322>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2492681>
- <https://github.com/kubevirt/kubevirt>
- <https://github.com/kubevirt/kubevirt/blob/e63503d2f3a166f79f0891f8e1c3450eb39f88ac/pkg/downwardmetrics/virtio-serial/server.go#L240-L251>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-6f2p-2qg2-qqch>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-6f2p-2qg2-qqch/>. Everything for agents: <https://agentprime.io/llms.txt>.