# CVE-2026-114575: TOTOLINK A950RG command injection in UploadCustomModule

Source: https://junglewise.ai/threats/cve-2026-114575-a-flaw-has-been-found-in-totolink-a950rg-4-1-2cu-5268-b20221104  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-22. Updated: 2026-10-22  
License: CC BY 4.0 with a link back

CVE-2026-114575 · Severity: critical · CVSS 10 · Published 2026-10-22

TOTOLINK A950RG is a wireless router used to provide network connectivity. A critical vulnerability allows an attacker to remotely execute arbitrary code as root without authentication by uploading a malicious module through the UploadCustomModule handler, gaining complete control of the device and the networks it serves.

Technologies: [TOTOLINK A950rg](https://junglewise.ai/threats/technologies/a950rg). Vendors: [TOTOLINK](https://junglewise.ai/threats/vendors/totolink).

## Quick answers

**Is CVE-2026-114575 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-114575 being exploited in the wild.

**How severe is CVE-2026-114575?** Critical severity, with a CVSS score of 10, published 22 October 2026.

**Which products and versions are affected?** TOTOLINK A950rg 4.1.2cu.5268_B20221104.

**Is there a fix for CVE-2026-114575?** 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-2026-114575 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-114575?** Check whether you run TOTOLINK A950rg 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

The UploadCustomModule handler in lib/cste_modules/product.so fails to validate the Action and FileUrl parameters properly, accepting requests that pass minimal checks (Action == "GetCustomModule" and FileUrl contains "custom.so"). The base64-encoded File parameter is copied into a fixed 204800-byte stack buffer using strcpy without length validation, decoded, and written to /tmp/custom_file; an integrity check compares the MD5 of the uploaded file against a user-supplied FileMd5 value, which is trivially bypassed by the attacker computing the MD5 themselves. The file is then loaded by bin/cste_sub (running as root) via system("initcste &"), resulting in arbitrary code execution. No authentication, signature verification, or vendor checks are performed.

## Affected products

- TOTOLINK A950RG 4.1.2cu.5268_B20221104

## Timeline

- 2026-10-22: disclosed

## References

- [https://gist.github.com/H3rmesk1t/3a629799af33425e07571182e539a794](https://gist.github.com/H3rmesk1t/3a629799af33425e07571182e539a794)
- [https://vuldb.com/cve/CVE-2026-114575](https://vuldb.com/cve/CVE-2026-114575)

## Related threats

- [TOTOLINK A950RG stack buffer overflow in MAC filter handler](https://junglewise.ai/threats/cve-2026-121600-a-flaw-has-been-found-in-totolink-a950rg-4-1-2cu-5268-b20221104)
- [TOTOLINK A950RG stack buffer overflow in WiFi configuration](https://junglewise.ai/threats/cve-2026-121599-a-vulnerability-was-detected-in-totolink-a950rg-4-1-2cu-5268)
- [TOTOLINK A950RG stack buffer overflow in wireless configuration](https://junglewise.ai/threats/cve-2026-121598-a-security-vulnerability-has-been-detected-in-totolink-a950rg-4)
- [TOTOLINK A950RG stack buffer overflow in Easy Setup Wizard](https://junglewise.ai/threats/cve-2026-121597-a-weakness-has-been-identified-in-totolink-a950rg-4-1-2cu-5268)
- [TOTOLINK A950RG stack buffer overflow in infostat.cgi](https://junglewise.ai/threats/cve-2026-116508-a-security-flaw-has-been-discovered-in-totolink-a950rg-4-1-2cu)