# CVE-2026-12174: D-Link DCS-935L HTTP rhea snprintf format string

> Remote attackers can exploit a format string vulnerability in the D-Link DCS-935L HTTP handler to potentially execute code or cause denial of service.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Jun 2026
- **Updated:** 15 Jun 2026
- **Also known as:** GHSA-hchg-fqww-5488

## What is CVE-2026-12174?

CVE-2026-12174 is a high-severity vulnerability in D-Link DCS-935L, published on 13 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A security vulnerability has been detected in D-Link DCS-935L 1.10.01. This issue affects the function snprintf of the file /web/cgi-bin/greece/rhea of the component HTTP Handler. Such manipulation of the argument data leads to format string. The attack may be launched remotely. The exploit has been disclosed publicly and may be used.

Weakness: CWE-134 (Use of Externally-Controlled Format String), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-12174?

It affects 1 product.


Products: Dlink Dcs-935l Firmware.

## How do I fix CVE-2026-12174?

No fix has been published for CVE-2026-12174 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12174 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12174 exists.

## Other vulnerabilities in D-Link DCS-935L

- [CVE-2019-17146](https://insights.sbomify.com/CVE-2019-17146/): Memory corruption in DCS-960L (high 8.8)
- [CVE-2026-13545](https://insights.sbomify.com/CVE-2026-13545/): D-Link DCS-935L POST Parameter setconf.cgi sub_400E40 os command injection (high 8.7)
- [CVE-2026-8260](https://insights.sbomify.com/CVE-2026-8260/): D-Link DCS-935L HNAP Service hnap_service SetDeviceSettings buffer overflow (high 8.7)
- [CVE-2025-10779](https://insights.sbomify.com/CVE-2025-10779/): D-Link DCS-935L HNAP1 sub_402280 stack-based overflow (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12174 and fix it if it is affected.

What it is: CVE-2026-12174 is a high-severity vulnerability in D-Link DCS-935L, published on 13 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12174 exists.

Affected product: D-Link DCS-935L. 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-2026-12174/ (Markdown: https://insights.sbomify.com/CVE-2026-12174/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12174
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12174
- OSV: https://osv.dev/vulnerability/CVE-2026-12174

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-12174/
Summaries are generated and may contain mistakes; the official description above is the record.