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CVE-2026-55490 is a vulnerability in OpenWrt's Emergency Access Daemon (ead) affecting versions before 25.12.5. The flaw is an integer underflow in the handle_send_a() function when processing a network message. The message length is decremented or otherwise transformed in a way that can underflow before the subsequent bounds check occurs. The resulting value is then passed to memcpy() as an extremely large size, leading to invalid memory handling and process termination. The issue is reachable before authentication and can be triggered by a single crafted UDP packet from an attacker on the local network segment.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A moderate pre-auth denial-of-service vulnerability in OpenWrt Emergency Access Daemon caused by an integer underflow in handle_send_a().
A moderate denial-of-service vulnerability in the Emergency Access Daemon caused by an integer underflow in handle_send_a(), allowing a crash via a crafted packet.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.