CVE-2026-62948

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 77% of all CVEs by exploit prediction. 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: epss, secondary
Elevated
9.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.6Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.6
EG Score
9.6(medium)
EG Risk
—
EPSS
25.0%
KEV
Not listed

Published

July 15, 2026

Last Modified

July 21, 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-535f
github_release Patch Available

v25.12.5

Patch available: openwrt/openwrt v25.12.5

https://github.com/openwrt/openwrt/releases/tag/v25.12.5
github_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/404
github_commit

commit 68f382690bfa (openwrt/odhcpd)

Fix landed in openwrt/odhcpd commit 68f382690bfa — awaiting tagged release

https://github.com/openwrt/odhcpd/commit/68f382690bfaec56d5b1f31c3c31c48bcb642e3a
github_commit

commit 55379d04fcc3 (openwrt/luci)

Fix landed in openwrt/luci commit 55379d04fcc3 — awaiting tagged release

https://github.com/openwrt/luci/commit/55379d04fcc3c605003a5001d6135cf02ae6048a

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 11× 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.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:25 UTCEPSS rescore
  4. 2026-07-21 15:25 UTCEPSS rescore
  5. 2026-07-20 17:08 UTCEPSS rescore
  6. 2026-07-19 14:31 UTCEPSS rescore
  7. 2026-07-19 02:29 UTCEPSS rescore
  8. 2026-07-18 10:04 UTCEPSS rescore
  9. 2026-07-16 17:03 UTCEPSS rescore
  10. 2026-07-15 17:54 UTCEG score recompute
  11. 2026-07-15 17:53 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

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, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-62948 actively exploited?
CVE-2026-62948 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 25.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-62948?
CVE-2026-62948 has a CVSS v3 base score of 9.6 (NVD).
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.

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