CVE-2026-62948

Critical

Description

OpenWrt is a Linux operating system targeting embedded devices. Prior to 25.12.5, odhcpd writes a DHCPv6 client FQDN option 39 hostname into /tmp/odhcpd.leases through src/statefiles.c statefiles_write_state6() and statefiles_write_state4() without escaping, allowing newline injection of forged lease lines that LuCI rpcd-mod-luci getDHCPLeases displays through htdocs/luci-static/resources/view/status/include/40_dhcp.js and htdocs/luci-static/resources/luci.js dom.append as live HTML in the Active DHCPv6 Leases admin page. This vulnerability is fixed in 25.12.5.

SeverityCritical

CVSS9.6

Exploit probability—

ProductOpenwrt

PublishedJul 15, 2026

First seenJul 15, 2026

Weakness typeCWE-79Cross-site scripting (XSS)CWE-117CWE-117 CWE-150CWE-150

How to fix

Update

openwrt openwrt25.12.5 or later

Affected products

Product	Affected versions	Fixed in
openwrt openwrt	v < 25.12.5	25.12.5

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