# CVE-2025-9001: LemonOS HTTP Client main.cpp HTTPGet stack-based overflow

> Remote attackers can trigger a stack-based buffer overflow in LemonOS HTTP Client via crafted chunkSize, potentially leading to code execution or crashes.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/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 Aug 2025
- **Updated:** 15 Aug 2025
- **Also known as:** GHSA-q4jv-qf8j-35f6

## What is CVE-2025-9001?

CVE-2025-9001 is a medium-severity memory corruption vulnerability in LemonOS, published on 15 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was determined in LemonOS up to nightly-2024-07-12 on LemonOS. Affected by this issue is the function HTTPGet of the file /Applications/Steal/main.cpp of the component HTTP Client. The manipulation of the argument chunkSize leads to stack-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

Weakness: CWE-121 (Stack-based Buffer Overflow), CWE-787 (Out-of-bounds Write), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2025-9001?

It affects 1 product.


Products: Lemonos Lemonos.

## How do I fix CVE-2025-9001?

No fix has been published for CVE-2025-9001 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-9001 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-9001 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-9001 and fix it if it is affected.

What it is: CVE-2025-9001 is a medium-severity memory corruption vulnerability in LemonOS, published on 15 Aug 2025. 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-2025-9001 exists.

Affected product: LemonOS. 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-2025-9001/ (Markdown: https://insights.sbomify.com/CVE-2025-9001/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-9001
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-9001
- OSV: https://osv.dev/vulnerability/CVE-2025-9001

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-9001/
Summaries are generated and may contain mistakes; the official description above is the record.