CVE-2026-9031 Authenticated Denial-of-Service in HTTPD Service in TP-Link Archer A6
An authenticated attacker can crash the HTTPD service on TP-Link Archer A6 routers via insufficient input validation, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-9031?
CVE-2026-9031 is a medium-severity denial of service vulnerability in TP-Link Systems Inc. Archer A6 v4, published on 7 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An input validation vulnerability exists in the HTTP-WRITEOEM handler due to insufficient validation of user-supplied data before it is processed by internal flash-write handling logic.
Successful exploitation may cause httpd process or device to crash, resulting in loss of access to the web interface and a denial-of-service condition.
Weakness: CWE-20
Which versions are affected by CVE-2026-9031?
How do I fix CVE-2026-9031?
No fix has been published for CVE-2026-9031 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-9031 being exploited?
There is no known exploitation of CVE-2026-9031 in the wild and no public exploit code.
Sources
Also known as GHSA-7f4x-hjwm-h5px.