CVE-2026-30872
OpenWrt mdns buffer overflow allows RCE via crafted IPv6 PTR DNS queries (UDP 5353).
Is CVE-2026-30872 being exploited?
Not confirmed. CVE-2026-30872 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 2.2% probability of exploitation in the next 30 days.
How severe is CVE-2026-30872?
CVE-2026-30872 is rated Critical with a CVSS score of 9.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-30872?
Yes. A fix has been recorded for CVE-2026-30872. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-30872 affect?
CVE-2026-30872 affects OpenWrt mdns daemon (pre-24.10.6, pre-25.12.1). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-30872?
Update to 24.10.6 or 25.12.1+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution on OpenWrt devices via mDNS IPv6 PTR query overflow (out-of-bounds write).
Patch when possible
- affected>= 25.12.0-rc1 and < 25.12.1
- affected< 24.10.6
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.