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CVE-2026-62948

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.

Security Impact Summary

This vulnerability carries a CRITICAL severity rating with a CVSS v3.1 score of 9.6, indicating it can be exploited remotely over the network with relatively low complexity though user interaction is required and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 1 product from openwrt organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2026, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2026-07-15T18:16:50.293

Last Modified

2026-07-21T16:06:30.357

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 9.6 (CRITICAL)

Weaknesses

Type: Secondary
CWE-79
CWE-117
CWE-150

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	openwrt	openwrt	< 25.12.5	Yes

References

https://github.com/openwrt/luci/commit/55379d04fcc3c605003a5001d6135cf02ae6048a Patch ([email protected])
https://github.com/openwrt/odhcpd/commit/68f382690bfaec56d5b1f31c3c31c48bcb642e3a Patch ([email protected])
https://github.com/openwrt/odhcpd/pull/404 Issue Tracking, Patch ([email protected])
https://github.com/openwrt/openwrt/releases/tag/v25.12.5 Release Notes ([email protected])
https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f Exploit, Mitigation, Vendor Advisory ([email protected])
https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535f Exploit, Mitigation, Vendor Advisory (134c704f-9b21-4f2e-91b3-4a467353bcc0)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For openwrt's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.