CVE-2026-26731Public exploit

Authenticated code execution via unbounded routername copy

Published Feb 17, 2026 · Updated Feb 17, 2026

Stack-based buffer overflow in TOTOLINK A3002RU 2.1.1-B20211108.1455 and earlier allows remote authenticated users to execute code. The formDnsv6 handler passes the untrusted routername parameter to strcpy, which copies it into a fixed-size stack buffer without a length check. Reaching the handler requires a valid web session and adjacent-network access; successful exploitation can crash the router or take control of execution.

CVSS severity8.0
High
EPSS probability0.50%
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 TOTOLINK A3002RU 2.1.1-B20211108.1455 and earlier allows remote authenticated users to execute code. The formDnsv6 handler passes the untrusted routername parameter to strcpy, which copies it into a fixed-size stack buffer without a length check. Reaching the handler requires a valid web session and adjacent-network access; successful exploitation can crash the router or take control of execution.

The record

CVE
CVE-2026-26731
Published
Feb 17, 2026
Updated
Feb 17, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, CWE-787, T1210
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 17, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.0CISA-ADPCVSS:3.1/AV:A/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
T1210Exploitation of Remote Services

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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