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CVE-2026-10666 is a stack-based out-of-bounds write in Zephyr's IPv4 address-with-port parsing logic in parse_ipv4() within subsys/net/ip/utils.c, reachable via net_ipaddr_parse(). When parsing strings in the form of an IPv4 literal followed by a colon and port, the implementation copies the attacker-controlled substring after the colon into a fixed 17-byte stack buffer using a copy length derived from the full input length rather than the destination buffer size. Because the port substring length is not properly bounded before the copy, a crafted address string with an excessively long suffix after the colon can overflow the stack buffer. The resulting memory corruption can crash the process and may permit control-flow hijacking depending on build and runtime conditions. The vulnerable parser is reachable through standard socket API address resolution, DNS server-string configuration, and the eswifi Wi-Fi co-processor DNS-response path. The flaw was introduced when the parser was added in Zephyr v1.9.0 and affects releases through v4.4.0.
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Cross-references every affected SKU, including bundled OEM variants.
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