CVE-2026-29972
Buffer overflow in nanoMODBUS v1.22.0 allows RCE via crafted Modbus responses.
Is CVE-2026-29972 being exploited?
Not confirmed. CVE-2026-29972 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 0.64% probability of exploitation in the next 30 days.
How severe is CVE-2026-29972?
CVE-2026-29972 is rated High with a CVSS score of 8.2. 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-2026-29972?
Not known from our data. No patch reference has been recorded for CVE-2026-29972, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-29972 affect?
CVE-2026-29972 affects nanoMODBUS (nanomodbus) <= v1.22.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-29972?
Upgrade to patched nanoMODBUS when released; ensure strict byte_count validation.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote attacker can overflow the caller buffer with mismatched byte_count, enabling potential remote code execution.
Patch when possible