Vulnerability · Published Oct 16, 2026 · Assigned by GitHub_M

CVE-2026-102693RIOT: Remote Stack Buffer Overflow in ATWINC15x0 driver via unsanitized SSID

Critical 9.6

In plain English

A critical-severity buffer overflow in RIOT from RIOT-OS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).

Severity (CVSS 3.1)9.6Critical

Exploit odds (30 days)0.2%top 86.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. Prior to 2026.04, the ATWINC15x0 driver's _atwinc15x0_sta_set_current_ssid function uses strcpy to copy an SSID without checking the destination size. When MODULE_ATWINC15X0_DYNAMIC_CONNECT is enabled, a nearby attacker can advertise a malformed or oversized SSID that is processed during Wi-Fi scanning, causing memory corruption and potentially a hard fault, denial of service, or code execution. This issue is fixed in version 2026.04.

Affected products (as reported)

Vendor	Product	Versions
RIOT-OS	RIOT	< 2026.04

Weakness: CWE-120, CWE-121 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-gwgv-6976-hxrg x_refsource_CONFIRM
https://github.com/RIOT-OS/RIOT/commit/5209c1b84f9771342f079b7d5d94d8207fdd5f0a x_refsource_MISC
https://github.com/RIOT-OS/RIOT/releases/tag/2026.04 x_refsource_MISC