# CVE-2026-13518: Tenda JD12L Pro stack buffer overflow in /goform/addressNat

Source: https://junglewise.ai/threats/cve-2026-13518-tenda-jd12l-pro-stack-buffer-overflow-in-goform-addressnat  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-29. Updated: 2026-06-29  
License: CC BY 4.0 with a link back

CVE-2026-13518 · Severity: high · CVSS 8.8 · Published 2026-06-29

A vulnerability exists in the Tenda JD12L Pro router, a device used for home and small office networking. An attacker can exploit this flaw to crash the router's management interface or potentially take full control of the device. This could allow an unauthorized user to monitor network traffic or use the router as a jumping-off point to attack other devices on the private network.

Technologies: [Tenda JD12L Pro](https://junglewise.ai/threats/technologies/jd12l-pro). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-13518 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-13518 being exploited in the wild.

**How severe is CVE-2026-13518?** High severity, with a CVSS score of 8.8, published 29 June 2026.

**Which products and versions are affected?** Tenda JD12L Pro 16.03.53.23.

**Is there a fix for CVE-2026-13518?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-13518 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-13518?** Check whether you run Tenda JD12L Pro at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow vulnerability exists in the 'fromAddressNat' function within the '/goform/addressNat' endpoint of Tenda JD12L Pro firmware version 16.03.53.23. The root cause is the unsafe use of the 'sprintf' function when processing the user-controlled 'page' parameter, which writes data into a fixed-size 256-byte buffer without length validation. A remote attacker can trigger this overflow by sending a POST request with an oversized 'page' argument. Successful exploitation can lead to memory corruption, overwriting the return address on the stack to achieve arbitrary code execution or a denial of service (DoS). While some reports suggest low privileges are required, a public PoC indicates the endpoint may be reachable without authentication.

## Affected products

- Tenda JD12L Pro 16.03.53.23

## Timeline

- 2026-05-27: disclosed: Vulnerability details and PoC published on GitHub.
- 2026-06-29: advisory: CVE published in NVD dataset.

## References

- [https://github.com/cve-a/Vampirensa/issues/4](https://github.com/cve-a/Vampirensa/issues/4)
- [https://vuldb.com/cve/CVE-2026-13518](https://vuldb.com/cve/CVE-2026-13518)
- [https://vuldb.com/submit/838889](https://vuldb.com/submit/838889)
- [https://vuldb.com/vuln/374526](https://vuldb.com/vuln/374526)
- [https://vuldb.com/vuln/374526/cti](https://vuldb.com/vuln/374526/cti)
- [https://www.tenda.com.cn/](https://www.tenda.com.cn/)

## Related threats

- [Tenda JD12L Pro stack buffer overflow in NatStaticSetting](https://junglewise.ai/threats/cve-2026-13519-tenda-jd12l-pro-stack-buffer-overflow-in-natstaticsetting)
- [Tenda JD12L Pro stack overflow in WifiBasicSet](https://junglewise.ai/threats/cve-2026-13517-tenda-jd12l-pro-stack-overflow-in-wifibasicset)
- [Tenda JD12L Pro stack buffer overflow in WifiGuestSet](https://junglewise.ai/threats/cve-2026-13516-tenda-jd12l-pro-stack-buffer-overflow-in-wifiguestset)
- [Tenda JD12L Pro stack overflow in SetPptpServerCfg](https://junglewise.ai/threats/cve-2026-13515-tenda-jd12l-pro-stack-overflow-in-setpptpservercfg)