CVE•Published 2026-04-29•Modified 2026-05-04•1 article on news•6 live references•NVD data
CVE-2026-7426Amazon · Freertos-plus-tcp
Vulnerability data via NVD (ingested)
CVSS v3.1
8.1
HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS percentile
3
Exploit Prediction Scoring System · top 97% of all CVEs
Weaknesses (CWE)
Description
Insufficient validation of the prefix length field in IPv6 Router Advertisement processing in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to cause memory corruption by sending a crafted Router Advertisement with a prefix length value exceeding the maximum valid length, resulting in a heap buffer overflow. Users processing IPv4 RA only are not impacted. To mitigate this issue, users should upgrade to the fixed version when available.
Timeline
Published 2026-04-29
Modified 2026-05-04
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-7426Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Amazon Freertos-plus-tcp"All exposed Amazon Freertos-plus-tcp instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Freertos-plus-tcp"HTTP body or banner mentions "Freertos-plus-tcp" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-7426Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-7426Censys host search filtered to this CVE id.
grep.app
CVE-2026-7426Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-7426GitHub code search for direct mentions.
Google dork
"CVE-2026-7426" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.