Is CVE-2026-105778 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-105778 being exploited in the wild.

How severe is CVE-2026-105778?

Critical severity, with a CVSS score of 9.9, published 6 October 2026.

Is there a fix for CVE-2026-105778?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-105778 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-105778?

Check whether you run Tenda AC5 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-105778: Tenda AC5 stack-based buffer overflow in WiFi handler

CVE-2026-105778 · Severity: critical · CVSS 9.9 · Published 2026-10-06

Tenda AC5 is a wireless router that manages home and small-office networks. An authenticated administrator can exploit a buffer overflow in the WiFi password parameter to corrupt memory, crash the device persistently (surviving reboots), or potentially execute arbitrary code. Recovery typically requires a factory reset.

Vendors: Tenda.

Quick answers

Is CVE-2026-105778 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-105778 being exploited in the wild.
How severe is CVE-2026-105778?: Critical severity, with a CVSS score of 9.9, published 6 October 2026.
Which products and versions are affected?: Tenda AC5 02.03.01.111_multi.
Is there a fix for CVE-2026-105778?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-105778 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-105778?: Check whether you run Tenda AC5 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A stack-based buffer overflow exists in the /goform/setWifi endpoint's wifiPwd parameter, which fails to validate input length before copying into a fixed-size buffer. An authenticated attacker can overwrite the program counter and corrupt NVRAM configuration memory, achieving instruction-pointer control and persistent denial-of-service. The vulnerability requires an authenticated admin session but enables complete device compromise.

Affected products

Tenda AC5 02.03.01.111_multi

Timeline

2026-10-06: disclosed: Vulnerability disclosed publicly with proof of concept

References

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