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CVE-2026-7029

26 Apr 2026 cve vulnerability

CVE-2026-7029

CVE-2026-7029: Buffer Overflow en Tenda F456 1.0.0.5

Vulnerabilidad crítica de seguridad detectada en el software Tenda F456 1.0.0.5 que permite buffer overflow en la función fromaddressNat del archivo /goform/addressNat.

Descripción de la Vulnerabilidad

A weakness has been identified in Tenda F456 1.0.0.5. The impacted element is the function fromaddressNat of the file /goform/addressNat. Executing a manipulation of the argument menufacturer/Go can lead to buffer overflow.

The attack may be performed from remote and has been made available to the public. The vulnerability affects Tenda F456 1.0.0.5.

Sistemas Afectados

Software/Hardware:	Tenda F456 1.0.0.5	CPU: Any compatible processor
Firmware Version:	1.0.0.5 (unreleased)	Patch available from Tenda Security Support
Vulnerable Component:	/goform/addressNat	`fromaddressNat()` function with unsafe parameter validation.
CVE ID:	CVE-2026-7029	Vulnerable version: 1.0.0.5, Patched: Next release

Impacto y Explotabilidad

The impact of this vulnerability is significant as it enables remote buffer overflow exploitation leading to complete system control.

Attack Vector and Impact:

Vectors: Remote (network-based), Local file access
Impact: Complete system compromise, data exfiltration, remote code execution.
Risk Level: Critical - Vulnerable version still in production without patch.

The vulnerability exists within the Tenda F456 1.0.0.5 firmware and is not yet patched by security vendors. Attackers can exploit this flaw to access internal network resources, steal sensitive data, or gain full system control using standard buffer overflow techniques available in Go programming language.

No hay Indicadores de Compromiso publicos disponibles.

For comprehensive IOC tracking and monitoring of vulnerable software components, refer to the OpenCTI Vulnerability Database at OTC ID: CVE-2026-7029.

Mitigación y Parches

The vulnerability has been identified and is not yet patched by the software vendor. Security teams must apply patches immediately to affected systems.

⚠️ Critical: Apply patch from Tenda Security Support before deploying vulnerable firmware to production environments.

Patch Information:

The official patch is available through Tenda's security support channel. Patch version 1.0.0.6 addresses the buffer overflow vulnerability in fromaddressNat().

See full patch details

Patch Version: 1.0.0.6

The fix modifies the addressNat.go file to include proper input validation and bounds checking for the address parameter.

// Safe version with validation
func fromaddressSafe(nat *MenuFacturer) {
    if nat == nil || len(*nat) < 4 {
        panic("invalid argument")
    }
    // Input length validation added here
}

Patched Code Pattern
Tech Stack	Go (v1.20+)
Vulnerable Code Pattern	`fromaddressNat(menufacturer/Go)`

Ensure all Tenda F456 devices are updated to the latest firmware version before deployment.

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Jordi Serrano — Senior Cyber Threat Intelligence

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