# CVE-2026-76651: Pre-Authentication Multipart Boundary Buffer Overflow in HTTP Service in TP-Link TL-WR841N

> Remote unauthenticated attackers can trigger a buffer overflow in the HTTP service via crafted multipart requests, causing memory corruption and undefined behavior.

- **Severity:** Medium 5.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Aug 2026
- **Updated:** 31 Aug 2026
- **Also known as:** GHSA-wqxh-m9g7-9pc2

## What is CVE-2026-76651?

CVE-2026-76651 is a medium-severity memory corruption vulnerability in TP-Link System Inc. TL-WR841N v14, published on 28 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### 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.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2026-76651?


## How do I fix CVE-2026-76651?

No fix has been published for CVE-2026-76651 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-76651 being exploited?

There is no known exploitation of CVE-2026-76651 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-76651 and fix it if it is affected.

What it is: CVE-2026-76651 is a medium-severity memory corruption vulnerability in TP-Link System Inc. TL-WR841N v14, published on 28 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-76651 in the wild and no public exploit code.

Affected product: TP-Link System Inc. TL-WR841N v14. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-76651/ (Markdown: https://insights.sbomify.com/CVE-2026-76651/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-76651
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-76651
- OSV: https://osv.dev/vulnerability/CVE-2026-76651

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-76651/
Summaries are generated and may contain mistakes; the official description above is the record.