CVE-2026-7656
ND handling flaw allows forged RA/NS/NA; risk of MITM and traffic redirection.
Is CVE-2026-7656 being exploited?
Not confirmed. CVE-2026-7656 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 0.33% probability of exploitation in the next 30 days.
How severe is CVE-2026-7656?
CVE-2026-7656 is rated High with a CVSS score of 8.1. 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-2026-7656?
Yes. A fix has been recorded for CVE-2026-7656. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-7656 affect?
CVE-2026-7656 affects Zephyr RTOS, IoT devices using Zephyr IPv6 ND. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-7656?
Upgrade to fixed Zephyr release with IPv6 ND fix
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Forge ND messages to reconfigure router/prefixes, MTU, and DNS (if enabled); enables MITM, traffic redirection, and DoS.
Patch when possible
- affected>= 1.14.0 and < 4.5.0
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.