CVE-2026-55490
MEDIUM
NVD
CVSS Score
6.5
Severity
MEDIUM
Published
Jul 07, 2026
Vendor
unknown
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.