# CVE-2026-3622: Denial-of-Service Vulnerability in UPnP Component of TP Link's TL-WR841N

> An out-of-bounds read in the UPnP component allows attackers to crash the service, causing a denial of service on TP-Link routers.

- **Severity:** High 7.1 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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:** 26 Mar 2026
- **Updated:** 27 Mar 2026
- **Also known as:** GHSA-hhj2-6q7v-v5hc

## What is CVE-2026-3622?

CVE-2026-3622 is a high-severity denial of service vulnerability in TP-Link Systems Inc. TL-WR841N v14, published on 26 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The vulnerability exists in the UPnP component of TL-WR841N v14, where improper input validation leads to an out-of-bounds read, potentially causing a crash of the UPnP service.  

Successful exploitation can cause the UPnP service to crash, resulting in a Denial-of-Service condition. 
This vulnerability affects TL-WR841N v14 < EN_0.9.1 4.19 Build 260303 Rel.42399n (V14_260303) and < US_0.9.1.4.19 Build 260312 Rel. 49108n (V14_0304).

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-3622?

It affects 1 product.


Products: Tp-Link Tl-Wr841n Firmware.

## How do I fix CVE-2026-3622?

No fix has been published for CVE-2026-3622 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3622 being exploited?

There is no known exploitation of CVE-2026-3622 in the wild and no public exploit code.

## Other vulnerabilities in TP-Link Systems Inc. TL-WR841N v14

- [CVE-2022-25073](https://insights.sbomify.com/CVE-2022-25073/): Memory corruption in n/a (critical 9.8)
- [CVE-2018-12575](https://insights.sbomify.com/CVE-2018-12575/): Auth bypass in n/a (critical 9.8)
- [CVE-2022-46912](https://insights.sbomify.com/CVE-2022-46912/): File upload in n/a (high 8.8)
- [CVE-2020-35576](https://insights.sbomify.com/CVE-2020-35576/): Command injection in n/a (high 8.8)
- [CVE-2019-17147](https://insights.sbomify.com/CVE-2019-17147/): Memory corruption in TL-WR841N (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3622 and fix it if it is affected.

What it is: CVE-2026-3622 is a high-severity denial of service vulnerability in TP-Link Systems Inc. TL-WR841N v14, published on 26 Mar 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-2026-3622 in the wild and no public exploit code.

Affected product: TP-Link Systems 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-2026-3622/ (Markdown: https://insights.sbomify.com/CVE-2026-3622/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3622
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3622
- OSV: https://osv.dev/vulnerability/CVE-2026-3622

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3622/
Summaries are generated and may contain mistakes; the official description above is the record.