CVE-2026-2906Public exploitNetwork attack vector

Authenticated code execution via serverString overflow

Published Feb 22, 2026 · Updated Feb 22, 2026

Stack-based buffer overflow in Tenda HG9 300001138 allows remote authenticated users to execute code or crash the web service. The formSamba function passes the request-controlled serverString value to sprintf, which writes a shell command into the 64-byte stack buffer v14 without a length bound. Reachability requires management access and sambaCap set to 1; overflowing v14 corrupts control data, enabling code execution or an HTTP-service crash.

CVSS severity8.8
High
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Tenda HG9 300001138 allows remote authenticated users to execute code or crash the web service. The formSamba function passes the request-controlled serverString value to sprintf, which writes a shell command into the 64-byte stack buffer v14 without a length bound. Reachability requires management access and sambaCap set to 1; overflowing v14 corrupts control data, enabling code execution or an HTTP-service crash.

The record

CVE
CVE-2026-2906
Published
Feb 22, 2026
Updated
Feb 22, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
HG9
Classifications
CWE-121, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=300001138

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · HG9version=300001138

Published CVSS scores

7.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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