# CVE-2026-110958: Wavlink WN530HG4B api.cgi heap-based overflow

> Remote attackers can exploit a heap-based buffer overflow in the api.cgi component of Wavlink routers to execute arbitrary code.

- **Severity:** Critical 10.0 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Oct 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-456r-r3m7-3f5f

## What is CVE-2026-110958?

CVE-2026-110958 is a critical memory corruption vulnerability in Wavlink WN530HG4B, published on 15 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was found in Wavlink WN530HG4B M30HG4B_V260724. The impacted element is an unknown function of the file api.cgi. The manipulation results in heap-based buffer overflow. It is possible to launch the attack remotely. The exploit has been made public and could be used. Upgrading to version 2026-09-24-841a51c6d5_tclinux.bin is sufficient to resolve this issue. The affected component should be upgraded. The vendor confirms: "We confirm the finding, and it has already been addressed. In the current firmware the api=info&client=app handler no longer builds a shell command: the login script is now invoked through an argument vector (execvp) instead of system(), and the client address is length-limited and null-checked."

Weakness: CWE-122 (Heap-based Buffer Overflow), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-110958?


## How do I fix CVE-2026-110958?

No fix has been published for CVE-2026-110958 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-110958 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110958 exists.

Public exploit code:

- https://github.com/shlln/CVE-2026-110958 (github_poc): https://github.com/shlln/CVE-2026-110958

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-110958 and fix it if it is affected.

What it is: CVE-2026-110958 is a critical memory corruption vulnerability in Wavlink WN530HG4B, published on 15 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110958 exists.

Affected product: Wavlink WN530HG4B. 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-2026-110958/ (Markdown: https://insights.sbomify.com/CVE-2026-110958/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-110958
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-110958
- OSV: https://osv.dev/vulnerability/CVE-2026-110958

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-110958/
Summaries are generated and may contain mistakes; the official description above is the record.