CVE-2026-55490 - OpenWrt: EAD Integer Underflow → Pre-Auth Denial of Service
Posted: Wed Jul 08, 2026 1:47 am
CVE ID: CVE-2026-55490
Published: July 7, 2026
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.
Severity: 6.5 | MEDIUM
More Information:
https://cvefeed.io/vuln/detail/CVE-2026-55490
Published: July 7, 2026
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.
Severity: 6.5 | MEDIUM
More Information:
https://cvefeed.io/vuln/detail/CVE-2026-55490