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CVE-2026-7422 is an insufficient input validation flaw in FreeRTOS-Plus-TCP affecting versions before V4.2.6 and V4.4.1. In the IPv4 and IPv6 receive paths, the stack's loopback detection logic treats packets whose Ethernet source MAC address matches one of the device's own registered endpoints as locally originated traffic. Because that path skips normal inbound validation, an adjacent network attacker can spoof the source MAC to match a local endpoint and cause the stack to bypass checksum verification and minimum-size checks. The issue is therefore a validation bypass in packet processing caused by trusting a spoofable link-layer identifier during loopback handling.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.