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CVE-2026-7424 is an integer-underflow vulnerability in the DHCPv6 sub-option parser of FreeRTOS-Plus-TCP. In the parser's handling of unknown DHCPv6 sub-options, an unsigned calculation involving the current sub-option payload length and the cumulative bytes consumed can underflow, causing the parser index to advance incorrectly and corrupting parser state. The issue affects deployments with DHCPv6 enabled, including FreeRTOS-Plus-TCP V4.0.0 through V4.2.5 and V4.3.0 through V4.4.0.
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No public exploit code observed for this vulnerability.
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15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An integer underflow vulnerability in the DHCPv6 sub-option parser of FreeRTOS-Plus-TCP that can be exploited by an adjacent network attacker to corrupt IPv6 network configuration and cause a denial of service when DHCPv6 is enabled.
An integer underflow vulnerability in the FreeRTOS-Plus-TCP DHCPv6 sub-option parser (prvDHCPv6_subOption()) that can be triggered by a single malformed DHCPv6 packet from an adjacent network device, causing parser corruption, incorrect IPv6/DNS configuration, and a permanent IP task freeze requiring hardware reset.
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.
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