CVE-2026-61477— Libvirt: libvirt: newline injection in network xml dns txt/srv fields allows dnsmasq config directive injection
Quick assessment
Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
libvirt是libvirt组织开源的一个虚拟化平台管理工具。 libvirt存在输入验证错误漏洞，该漏洞源于网络XML解析器未从DNS TXT记录值属性和SRV记录域名/目标属性中去除换行符，导致这些值被原样写入dnsmasq配置文件，可能允许具有定义虚拟网络权限的用户注入任意dnsmasq配置指令，从而导致以root身份执行任意命令。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 6 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 7 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 8 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 9 | any |
affected |
| Red Hat | Red Hat Enterprise Linux for NVIDIA 26 | any |
affected |
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I. Basic Information for CVE-2026-61477
Vulnerability Information
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Vulnerability Title
Libvirt: libvirt: newline injection in network xml dns txt/srv fields allows dnsmasq config directive injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
libvirt 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libvirt是libvirt组织开源的一个虚拟化平台管理工具。 libvirt存在输入验证错误漏洞，该漏洞源于网络XML解析器未从DNS TXT记录值属性和SRV记录域名/目标属性中去除换行符，导致这些值被原样写入dnsmasq配置文件，可能允许具有定义虚拟网络权限的用户注入任意dnsmasq配置指令，从而导致以root身份执行任意命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Shenlong Deep Dive — AI Deep Analysis
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Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | - |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 | - |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 | - |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Enterprise Linux for NVIDIA 26 | - |
cpe:/a:redhat:enterprise_linux_nvidia:
|
|
II. Public POCs for CVE-2026-61477
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-61477 (1)
Vendor Advisories for CVE-2026-61477 (2)
Same Patch Batch · Red Hat · 2026-08-07 · 4 CVEs total
| CVE-2026-15816 | 7.5 HIGH | Dracut: dracut: root code execution via unescaped error message written to sourced emergen |
| CVE-2026-18938 | 6.2 MEDIUM | P11-kit: integer overflow in rpc attribute-array length calculation can under-allocate nes |
| CVE-2026-19079 | 4.4 MEDIUM | Policycoreutils: policycoreutils: toctou race condition in fixfiles allows arbitrary selin |
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