# CVE-2026-90692: D-Link DIR-878 Dynamic DNS IPv6 Settings SetDynamicDNSIPv6Settings stack-based overflow

> Remote attackers can trigger a stack-based buffer overflow in the Dynamic DNS IPv6 settings, potentially leading to arbitrary code execution on D-Link DIR-878 routers.

- **Severity:** Critical 9.4 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X`)
- **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:** 14 Sep 2026
- **Updated:** 15 Sep 2026
- **Also known as:** GHSA-vmqq-69gc-qcmg

## What is CVE-2026-90692?

CVE-2026-90692 is a critical memory corruption vulnerability in D-Link DIR-878, published on 14 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was detected in D-Link DIR-878 120B05. This affects the function SetDynamicDNSIPv6Settings of the component Dynamic DNS IPv6 Settings. The manipulation of the argument IPv6Address/Hostname results in stack-based buffer overflow. The attack may be launched remotely.

Weakness: CWE-121 (Stack-based Buffer Overflow), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-90692?


## How do I fix CVE-2026-90692?

No fix has been published for CVE-2026-90692 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-90692 being exploited?

There is no known exploitation of CVE-2026-90692 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90692 and fix it if it is affected.

What it is: CVE-2026-90692 is a critical memory corruption vulnerability in D-Link DIR-878, published on 14 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-90692 in the wild and no public exploit code.

Affected product: D-Link DIR-878. 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-2026-90692/ (Markdown: https://insights.sbomify.com/CVE-2026-90692/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90692
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90692
- OSV: https://osv.dev/vulnerability/CVE-2026-90692

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90692/
Summaries are generated and may contain mistakes; the official description above is the record.