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Freertos Plus Tcp EUVDEUVD-2026-26275

| CVE-2026-7422 HIGH
Authentication Bypass by Spoofing (CWE-290)
2026-04-29 AMZN
Authentication Bypass Freertos Plus Tcp
7.1
CVSS 4.0 · NVD
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Severity by source

NVD PRIMARY
7.1 HIGH
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

5
Severity Changed
Apr 29, 2026 - 19:22 NVD
MEDIUM HIGH
CVSS changed
Apr 29, 2026 - 19:22 NVD
6.5 (MEDIUM) 7.1 (HIGH)
EUVD ID Assigned
Apr 29, 2026 - 19:00 euvd
EUVD-2026-26275
Patch released
Apr 29, 2026 - 19:00 nvd
Patch available
CVE Published
Apr 29, 2026 - 18:35 nvd
HIGH 7.1

DescriptionCVE.org

Insufficient packet validation in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to bypass all checksum and minimum-size validation by spoofing the Ethernet source MAC address to match one of the device's own registered endpoints, because the loopback detection mechanism skips all input validation for packets whose source MAC matches a local endpoint.

To mitigate this issue, users should upgrade to the fixed version when available.

Analysis

Insufficient packet validation in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to bypass all checksum and minimum-size validation by spoofing the Ethernet source MAC address to match one of the device's own registered endpoints, because the loopback detection mechanism skips all input validation for packets whose source MAC matches a local endpoint.

To mitigate this issue, users should upgrade to the fixed version when available.

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EUVD-2026-26275 vulnerability details – vuln.today
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