CVE-2026-62948: OpenWrt is a Linux operating system targeting embedded devices

Q: How do I fix CVE-2026-62948?

openwrt: upgrade to 25.12.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-62948 being exploited?

CVE-2026-62948 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-62948 affect?

CVE-2026-62948 affects openwrt. Severity is critical (CVSS 9.6). 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()

Q: How urgent is CVE-2026-62948?

Priority 55/100. Critical severity; Public exploit reference; On your watchlist

This month

CRITICAL 9.6WATCHLISTUPGRADE

CVE-2026-62948 is a critical-severity flaw (CVSS 9.6) affecting openwrt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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/reso

Why this priority

Critical severity
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-79, CWE-117, CWE-150
Published	2026-07-15
Last modified	2026-07-21

Publisher (CNA): GitHub, Inc. · Vendor: openwrt

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-15 18:16 UTCPublished CVE record published
2026-07-21 16:06 UTCUpdated Record last modified

openwrt openwrt UPGRADE

Affected: < 25.12.5

Fixed in: 25.12.5

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-62948?

openwrt: upgrade to 25.12.5. Exact commands for each OS are on this page.

Is CVE-2026-62948 being exploited?

CVE-2026-62948 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-62948 affect?

CVE-2026-62948 affects openwrt. Severity is critical (CVSS 9.6). 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()

How urgent is CVE-2026-62948?

Priority 55/100. Critical severity; Public exploit reference; On your watchlist

Software pages

OpenWrt vulnerabilities

Related CVEs

CVE-2026-62947 MEDIUM 4.9 UPGRADE OpenWrt is a Linux operating system targeting embedded devices
CVE-2026-55490 MEDIUM 6.5 UPGRADE OpenWrt is a Linux operating system targeting embedded devices

References

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