What is CVE-2026-102692?

CVE-2026-102692 is a critical-severity vulnerability in Riot-Os Riot, classified under Integer Overflow or Wraparound. CVSS score: 9.1/10. Published 2026-10-16.

How severe is CVE-2026-102692?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Buffer overflow in Riot-Os Riot

CVE-2026-102692

RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. Prior to 2026.07, nanocoap accepts oversized CoAP Block2 option values without enforcing the 20-bit maximum block number, allowing block offset multiplication to overflow on 32-bit targets. The affected master baseline is commit aeeae69e; the verified fix is later on master and remains unreleased. The oversized value passes from coap_get_blockopt() to coap_block_slicer_init(). A remote CoAP client can send a malformed Block2 option that produces an invalid slice range and can cause out-of-bounds memory access, denial of service, or memory corruption. This vulnerability is fixed in 2026.07.

Vulnerability class: Integer Overflow

Published 2026-10-16 · last modified 2026-10-16.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Riot-Os Riot — versions < 2026.07

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-102692?: CVE-2026-102692 is a critical-severity vulnerability in Riot-Os Riot, classified under Integer Overflow or Wraparound. CVSS score: 9.1/10. Published 2026-10-16.
How severe is CVE-2026-102692?: Critical severity. CVSS v3 base score is 9.1 out of 10.