Nanomsg versions 0.5-beta through 1.x before 1.2.3 has a remotely exploitable buffer overflow in the WebSocket transport, due to an unchecked copy of the Sec-WebSocket-Version header, through snprintf.
CVSS 4.0HIGH 8.6·Network·Low privileges·No interaction·EPSS 0.00313·Published 2026-09-24·Fixed in 1.2.3CWE-122