Detections
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CVE-2026-55490
medium
Description
OpenWrt is a Linux operating system targeting embedded devices. Before v25.12.5, an integer underflow in handle_send_a() of the Emergency Access Daemon allows any unauthenticated attacker on the local network to crash the daemon by sending a single crafted UDP packet. The message length underflows before a bounds check and is then passed to memcpy as a very large size. This issue is fixed v25.12.5.
References
https://github.com/openwrt/openwrt/security/advisories/GHSA-9558-77jp-g3fw
https://github.com/openwrt/openwrt/releases/tag/v25.12.5
https://github.com/openwrt/openwrt/commit/63c0767f3d02f7b10b0f0b5293366bd059a08ca5