Skip to content
Fencer Vulns
low 2.3

CVE-2026-61477 json

Libvirt: libvirt: newline injection in network xml dns txt/srv fields allows dnsmasq config directive injection

published 2026-08-07 3 mo ago modified 2026-11-06 2 d ago also EUVD-2026-54487

cvss
2.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits
0
none known

Summary

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.

Patch / fix

  • libvirt Debian 13 11.3.0-3+deb13u3
  • libvirt Debian 14 12.6.0-1

debian advisories DEBIAN-CVE-2026-61477

  • libvirt Ubuntu 22.04 LTS 8.0.0-1ubuntu7.19
  • libvirt Ubuntu 24.04 LTS 10.0.0-2ubuntu8.16
  • libvirt Ubuntu 26.04 LTS 12.0.0-1ubuntu5.3
  • libvirt-hwe Ubuntu 26.04 LTS 12.0.0-1ubuntu5.5
  • libvirt Ubuntu Pro 16.04 LTS 1.3.1-1ubuntu10.31+esm1
  • libvirt Ubuntu Pro 18.04 LTS 4.0.0-1ubuntu8.21+esm1
  • libvirt Ubuntu Pro 20.04 LTS 6.0.0-0ubuntu8.20+esm1

ubuntu advisories UBUNTU-CVE-2026-61477

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libvirt SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 9.0.0-150500.6.29.1
  • libvirt SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 8.0.0-150400.7.17.1
  • libvirt SLE Module for Server Applications 15 SP7, SLE Module for Basesystem 15 SP7 11.0.0-150700.4.27.1
  • libvirt SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 11.4.0-160000.5.1
  • libvirt Linux Micro 6.0 10.0.0-5.1
  • libvirt Linux Micro 6.1 10.0.0-slfo.1.1_3.1
  • libvirt SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 5.1.0-13.48.1
  • libvirt SLES for SAP 15 SP6, SLES 15 SP6-LTSS 10.0.0-150600.8.18.1

suse advisories SUSE-SU-2026:4141-1SUSE-SU-2026:4010-1SUSE-SU-2026:4009-1SUSE-SU-2026:4004-1SUSE-SU-2026:3939-1SUSE-SU-2026:23460-1

  • libvirt openSUSE Leap 16.0 11.4.0-160000.5.1

opensuse advisories openSUSE-SU-2026:21738-1

  • libvirt Azure Linux 3.0 11.9.0-1

azure linux advisories AZL-95478

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-61477 updated cvss 2.3

libvirt: libvirt: newline injection in network XML DNS TXT/SRV fields allows dnsmasq config directive injection

  • Red Hat Enterprise Linux 6 libvirt, libvirt-client, libvirt-python, libvirt-lock-sanlock Red Hat Enterprise Linux 7 libvirt, libvirt-nss, libvirt-libs, libvirt-admin, libvirt-client, libvirt-daemon, +24 more Red Hat Enterprise Linux 8 libvirt, libvirt-nss, libvirt-libs, libvirt-admin, libvirt-client, libvirt-daemon, +22 more Red Hat Enterprise Linux 9 libvirt, libvirt-nss, libvirt-libs, libvirt-client, libvirt-daemon, libvirt-ssh-proxy, +25 more Red Hat Enterprise Linux 10 libvirt Red Hat Enterprise Linux for NVIDIA 26 libvirt
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 2.3 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux for NVIDIA 26

Classification

Weakness
  • CWE-93 Improper Neutralization of CRLF Sequences

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.