# CVE-2026-75124: PLANET GS-4210-16P2S V3 Memory Corruption via dispatcher.cgi _readHttpParam

> An unauthenticated remote attacker can cause denial of service or potential code execution on PLANET managed switches via oversized HTTP requests.

- **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:** 28 Aug 2026
- **Updated:** 1 Sep 2026
- **Also known as:** GHSA-fx37-w2g6-gg44

## What is CVE-2026-75124?

CVE-2026-75124 is a high-severity memory corruption vulnerability in PLANET GS-4210-16P2S V3, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains a pre-authentication memory corruption vulnerability in the web management interface where the _readHttpParam function copies an oversized HTTP query string without guaranteeing NUL termination, allowing parse_query_string to process attacker-controlled data into a fixed-size stack buffer. An unauthenticated remote attacker can send an oversized GET request to dispatcher.cgi to cause denial of service of the web management interface and potentially trigger memory corruption.

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2026-75124?


## How do I fix CVE-2026-75124?

No fix has been published for CVE-2026-75124 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-75124 being exploited?

There is no known exploitation of CVE-2026-75124 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-75124 and fix it if it is affected.

What it is: CVE-2026-75124 is a high-severity memory corruption vulnerability in PLANET GS-4210-16P2S V3, published on 28 Aug 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-2026-75124 in the wild and no public exploit code.

Affected product: PLANET GS-4210-16P2S V3. 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-2026-75124/ (Markdown: https://insights.sbomify.com/CVE-2026-75124/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-75124
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-75124
- OSV: https://osv.dev/vulnerability/CVE-2026-75124

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-75124/
Summaries are generated and may contain mistakes; the official description above is the record.