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.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
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
Which versions are affected by CVE-2026-61477?
How do I fix CVE-2026-61477?
Apply the vendor's patch.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-61477 being exploited?
There is no known exploitation of CVE-2026-61477 in the wild and no public exploit code.
Sources
Also known as AZL-95478, DEBIAN-CVE-2026-61477, GHSA-f6jp-rhmm-v59g, UBUNTU-CVE-2026-61477.