Copyright © 2012 Red Hat, Inc. All rights reserved. Low 2026-08-06T14:16:37 libvirt: libvirt: newline injection in network XML DNS TXT/SRV fields allows dnsmasq config directive injection 2.3 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N CWE-93

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.

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.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Red Hat Enterprise Linux 10 Fix deferred libvirt Red Hat Enterprise Linux 6 Fix deferred libvirt Red Hat Enterprise Linux 7 Fix deferred libvirt Red Hat Enterprise Linux 8 Fix deferred virt:rhel/libvirt Red Hat Enterprise Linux 9 Fix deferred libvirt Red Hat Enterprise Linux for NVIDIA 26 Fix deferred libvirt https://www.cve.org/CVERecord?id=CVE-2026-61477 https://nvd.nist.gov/vuln/detail/CVE-2026-61477 https://gitlab.com/libvirt/libvirt/-/commit/3cfc77963b512d809348fca07f97fe924fac9a05