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CVE-2026-7423 is an integer underflow vulnerability in the ICMP and ICMPv6 echo reply handlers in FreeRTOS-Plus-TCP before versions 4.4.1 and 4.2.6. When processing echo replies, the code subtracts protocol header sizes from a packet length field without first verifying that the length is at least as large as the headers being removed. If a malformed packet carries an undersized length value, this subtraction underflows, producing an invalid large length and leading to a heap out-of-bounds read of up to approximately 65 KB. The issue is reachable in configurations where outgoing ping support is enabled.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
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.