# CVE-2026-111710: Netcore NR256CN through 1.5.140116 Boa Web Server NULL Pointer Dereference DoS

> Unauthenticated attackers can crash the Netcore NR256CN router's management interface by sending a malformed Authorization header to the Boa web server.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Oct 2026
- **Updated:** 19 Oct 2026
- **Also known as:** GHSA-w32x-fxxg-m4fc

## What is CVE-2026-111710?

CVE-2026-111710 is a high-severity vulnerability in Netcore NR256CN, published on 16 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Netcore NR256CN through 1.5.140116 contains a NULL pointer dereference vulnerability in the Boa web server's user_auth() function that allows unauthenticated attackers to crash the server via a malformed Authorization header. Attackers can send a Basic Authorization value lacking a colon, such as one decoding to a single character, to protected routes like /router/get_user_type.cgi to kill the main Boa process and deny management interface access.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2026-111710?


## How do I fix CVE-2026-111710?

No fix has been published for CVE-2026-111710 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-111710 being exploited?

There is no known exploitation of CVE-2026-111710 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-111710 and fix it if it is affected.

What it is: CVE-2026-111710 is a high-severity vulnerability in Netcore NR256CN, published on 16 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-111710 in the wild and no public exploit code.

Affected product: Netcore NR256CN. 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-2026-111710/ (Markdown: https://insights.sbomify.com/CVE-2026-111710/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-111710
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-111710
- OSV: https://osv.dev/vulnerability/CVE-2026-111710

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-111710/
Summaries are generated and may contain mistakes; the official description above is the record.