CVE-2026-30871
OpenWrt mdns stack overflow via PTR queries on UDP 5353.
Is CVE-2026-30871 being exploited?
Not confirmed. CVE-2026-30871 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 1.2% probability of exploitation in the next 30 days.
How severe is CVE-2026-30871?
CVE-2026-30871 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-2026-30871?
Yes. A fix has been recorded for CVE-2026-30871. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-30871 affect?
CVE-2026-30871 affects OpenWrt mdns daemon, OpenWrt routers/embedded devices. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-30871?
Upgrade to 24.10.6 or 25.12.1; restart affected devices
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via crafted PTR DNS queries exploiting mdns parse_question stack overflow.
Patch when possible
- affected< 24.10.6
- affected>= 25.12.0-rc1 and < 25.12.1
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.