High 7.7Published Oct 16, 2026

CVE-2026-102551Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router Advertisement handling

Updated under an hour ago (Oct 28, 2026, 11:50 AM ET)

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It affects FreeRTOS-Plus-TCP. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.27%, higher than 20% of scored CVEs.

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Exploited in the last 30 days

Improper verification of the source of a communication channel in the IPv6 Router Advertisement handler in Amazon FreeRTOS-Plus-TCP before V4.4.2 might allow a remote third-party to influence an endpoint's IPv6 default gateway, on-link prefix, and address configuration via a crafted Router Advertisement. To remediate this issue, users should upgrade to version V4.4.2.

CVSS: 7.7 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
Weakness (CWE): CWE-940
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.27% (percentile 20)
Assigned by: AMZN
NVD analysis: Awaiting Analysis
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 16, 2026

Affected products

Affected products

FreeRTOS FreeRTOS-Plus-TCP freertos:plus_tcp (from the name)	through 4.4.1	CNA record

References

References

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.2	release-notes, patch
https://aws.amazon.com/security/security-bulletins/2026-139-aws/	vendor-advisory
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-pjq5-fqrr-g6pv	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.