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.
CVE-2026-62948
CRITICALPre-NVD 9.69.6Elevated
EchelonGraph scoreLOW confidence
This critical-severity CVE scores 9.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: secondary
9.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 9.6Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.6
- EG Score
- 9.6(low)
- EPSS
- —
- KEV
- Not listed
Published
July 15, 2026
Last Modified
July 15, 2026
Advisory Details (5)
Auto-updated Jul 15, 2026🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available🟡 PoC Available
odhcpd/LuCI: unauthenticated DHCPv6 client can inject lease-file lines via FQDN hostname → stored XSS in the LuCI admin UI · Advisory · openwrt/openwrt · GitHub
https://github.com/openwrt/openwrt/security/advisories/GHSA-hhmc-92hw-535fgithub_release Patch Available
v25.12.5
Patch available: openwrt/openwrt v25.12.5
https://github.com/openwrt/openwrt/releases/tag/v25.12.5github_pr
statefiles: escape client hostnames in the lease state file
Fix merged in openwrt/odhcpd PR #404 on 2026-06-27 — awaiting tagged release
https://github.com/openwrt/odhcpd/pull/404github_commit
commit 68f382690bfa (openwrt/odhcpd)
Fix landed in openwrt/odhcpd commit 68f382690bfa — awaiting tagged release
https://github.com/openwrt/odhcpd/commit/68f382690bfaec56d5b1f31c3c31c48bcb642e3agithub_commit
commit 55379d04fcc3 (openwrt/luci)
Fix landed in openwrt/luci commit 55379d04fcc3 — awaiting tagged release
https://github.com/openwrt/luci/commit/55379d04fcc3c605003a5001d6135cf02ae6048aWeakness Classification(3)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 3× in last 7d / 3× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-15 22:13 UTCEG score recompute
- 2026-07-15 17:54 UTCEG score recompute
- 2026-07-15 17:53 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(4)
What is CVE-2026-62948?
CVE-2026-62948 is a critical vulnerability published on July 15, 2026. 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 statefileswritestate6() and statefileswritestate4() without escaping, allowing newline injection of forged lease…
When was CVE-2026-62948 disclosed?
CVE-2026-62948 was first published in the National Vulnerability Database on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-62948?
CVE-2026-62948 has a CVSS v3 base score of 9.6 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-62948?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-62948, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-62948
Is Your Infrastructure Affected by CVE-2026-62948?
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