# CVE-2026-61477: Libvirt: libvirt: newline injection in network xml dns txt/srv fields allows dnsmasq config directive injection

> Attackers with network definition permissions can inject newlines into DNS fields to execute arbitrary commands as root via dnsmasq configuration.

- **Severity:** Low 2.3 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 7 Aug 2026
- **Updated:** 7 Aug 2026
- **Also known as:** AZL-95478, DEBIAN-CVE-2026-61477, GHSA-f6jp-rhmm-v59g, UBUNTU-CVE-2026-61477

## What is CVE-2026-61477?

CVE-2026-61477 is a low-severity command injection vulnerability in Red Hat Enterprise Linux 10, published on 7 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An injection vulnerability was found in libvirt's virtual network driver. The network XML parser does not strip newline characters from DNS TXT record value attributes and SRV record domain/target attributes. These values are written verbatim into the dnsmasq configuration file generated by the network driver, allowing a user with permission to define virtual networks to inject arbitrary dnsmasq configuration directives such as dhcp-script, leading to arbitrary command execution as root.

Weakness: CWE-93 (Improper Neutralization of CRLF Sequences)

## Which versions are affected by CVE-2026-61477?


## How do I fix CVE-2026-61477?

Apply the vendor's patch.

## Is CVE-2026-61477 being exploited?

There is no known exploitation of CVE-2026-61477 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-61477 and fix it if it is affected.

What it is: CVE-2026-61477 is a low-severity command injection vulnerability in Red Hat Enterprise Linux 10, published on 7 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-61477 in the wild and no public exploit code.

Affected product: Red Hat Enterprise Linux 10. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-61477/ (Markdown: https://insights.sbomify.com/CVE-2026-61477/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-61477
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-61477
- OSV: https://osv.dev/vulnerability/CVE-2026-61477

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-61477/
Summaries are generated and may contain mistakes; the official description above is the record.