Vulnerability · Published Aug 28, 2026 · Assigned by TPLink
CVE-2026-76651Pre-Authentication Multipart Boundary Buffer Overflow in HTTP Service in TP-Link TL-WR841N
Medium 5.3
In plain English
A medium-severity buffer overflow in TL-WR841N v14 from TP-Link System Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).
Official description
A buffer overflow vulnerability exists in the embedded HTTP service in TL-WR841N v14 when processing multipart/form-data requests. Insufficient validation of an attacker-controlled boundary parameter may allow a remote unauthenticated attacker to submit a crafted request that corrupts memory by overwriting data beyond the bounds of an internal buffer. Successful exploitation may result in modification or corruption of process memory, potentially leading to undefined application behavior. Arbitrary code execution, information disclosure, and denial-of-service conditions have not been demonstrated.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| TP-Link System Inc. | TL-WR841N v14 | 0 – before TL-WR841N(US)_V14_4.19 Build 260820 Rel.334780 – before TL-WR841N(EU)_V14_4.19 Build 260821 Rel.56588 |
Weakness: CWE-120 · Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N