CVE-2026-25139
Unauthenticated out-of-bounds read in RIOT 6LoWPAN stack
Is CVE-2026-25139 being exploited?
Not confirmed. CVE-2026-25139 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 0.50% probability of exploitation in the next 30 days.
How severe is CVE-2026-25139?
CVE-2026-25139 is rated High. 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-2026-25139?
Yes. A fix has been recorded for CVE-2026-25139. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-25139 affect?
CVE-2026-25139 affects RIOT OS 2025.10 and prior, IoT devices using RIOT OS 6LoWPAN stack. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-25139?
Monitor advisories; plan upgrade to patched RIOT OS when available
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated read of adjacent memory or crash via crafted 6LoWPAN packets; potential device compromise.
Monitor only
- affected<= 2025.10
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.