Input Validation Flaw in TP-Link Archer Routers
CVE-2026-9031

6.8MEDIUM

Key Information:

Vendor

Tp-link Systems Inc.

Status
Archer A6 V4
Vendor
CVE Published:
7 August 2026

What is CVE-2026-9031?

An input validation vulnerability exists in the HTTP-WRITEOEM handler of TP-Link Archer routers due to inadequate validation of user-supplied data. This flaw can lead to a situation where the httpd process or the device itself may crash. The result is a denial-of-service condition, which leaves users unable to access the web interface.

Affected Version(s)

Archer A6 v4 0

References

https://www.tp-link.com/us/support/download/archer-a6/v4/...
patch
https://www.tp-link.com/en/support/download/archer-a6/v4/...
patch
https://www.tp-link.com/en/support/faq/5234/
vendor-advisory

CVSS V4

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Dariusz Gońda
.