# CVE-2026-10047: Out-of-bounds write in Napoca real-mode hook handler via guest-controlled SS:SP (VA-13905)

> An attacker can trigger an out-of-bounds write in the Bitdefender Napoca hypervisor via guest-controlled registers, potentially leading to code execution or privilege escalation.

- **Severity:** High 8.5 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Jun 2026
- **Updated:** 2 Jun 2026
- **Also known as:** GHSA-m94v-7gjf-wmxq

## What is CVE-2026-10047?

CVE-2026-10047 is a high-severity memory corruption vulnerability in Bitdefender Napoca bare-metal hypervisor, published on 2 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The Bitdefender Napoca bare-metal hypervisor contains an out-of-bounds write vulnerability in the real-mode hook handler, implemented in napoca/kernel/handler.c. The handler uses a guest-controlled SS:SP-derived offset as an index into the 1MB RealModeMemory buffer without bounds validation. With SS=0xFFFF and ESP=0xFFFF, the computed offset can reach 0x10FFEF, exceeding the RealModeMemory buffer by 65,519 bytes. The IRET frame push can therefore write past the end of the buffer into the hypervisor heap. The product is end-of-life and unsupported when assigned.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2026-10047?

It affects 1 product.


Products: Bitdefender Napoca.

## How do I fix CVE-2026-10047?

No fix has been published for CVE-2026-10047 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-10047 being exploited?

There is no known exploitation of CVE-2026-10047 in the wild and no public exploit code.

## Other vulnerabilities in Bitdefender Napoca bare-metal hypervisor

- [CVE-2026-10046](https://insights.sbomify.com/CVE-2026-10046/): Out-of-bounds write in Napoca BIOS INT 0x15 E820 memory map handler (VA-13905) (high 8.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-10047 and fix it if it is affected.

What it is: CVE-2026-10047 is a high-severity memory corruption vulnerability in Bitdefender Napoca bare-metal hypervisor, published on 2 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-10047 in the wild and no public exploit code.

Affected product: Bitdefender Napoca bare-metal hypervisor. 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-2026-10047/ (Markdown: https://insights.sbomify.com/CVE-2026-10047/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-10047
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-10047
- OSV: https://osv.dev/vulnerability/CVE-2026-10047

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-10047/
Summaries are generated and may contain mistakes; the official description above is the record.