CVE-2026-55490

MediumCVSS 6.5/10Last modified Jul 10, 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.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-191

Affected software

No affected versions have been published.

Timeline

Published: Jul 7, 2026
Last modified: Jul 10, 2026
NVD status: Analyzed

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