CVE-2026-55490
Medium · 6.5CVSS
6.5
EPSS
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Published
Jul 7, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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