CVE-2026-129104

Description

Cudy TR3000 before 2.5.42 contains a dnsmasq configuration injection vulnerability that allows authenticated administrators to inject directives by embedding a newline in the net.set_dhcp leasetime field. Attackers can append address= entries via /etc/init.d/dnsmasq to alter DNS answers for LAN clients, or insert invalid lines that stop dnsmasq.

References

• https://d1jvyy13vm72kv.cloudfront.net/device/upgrade/m_upgrade_TR3000_256MB_Flash-R103-2.5.42-20261103-160202-sysupgrade_82672.zip
• https://www.cudy.com/en-us/pages/download-center/tr3000-1-0
• https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-dnsmasq-configuration-injection-via-net-set-dhcp