# CVE-2026-10047: Bitdefender Napoca out-of-bounds write in real-mode hook handler

Source: https://junglewise.ai/threats/cve-2026-10047-bitdefender-napoca-out-of-bounds-write-in-real-mode-hook-handler  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-02. Updated: 2026-06-02  
License: CC BY 4.0 with a link back

CVE-2026-10047 · Severity: info · CVSS 8.5 · Published 2026-06-02

Bitdefender Napoca is a bare-metal hypervisor used to manage and isolate virtual machine environments. A security flaw allows a user on a guest virtual machine to write data into the hypervisor's private memory. This could lead to a complete takeover of the host system or a total service outage. Because the product is end-of-life, no security updates will be released, and users are advised to stop using the software.

Vendors: [Bitdefender](https://junglewise.ai/threats/vendors/bitdefender).

## Quick answers

**Is CVE-2026-10047 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-10047 being exploited in the wild.

**How severe is CVE-2026-10047?** Informational severity, with a CVSS score of 8.5, published 2 June 2026.

**Which products and versions are affected?** Bitdefender Napoca All versions (End-of-Life).

**Is there a fix for CVE-2026-10047?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-10047 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-10047?** Check whether you run Bitdefender Napoca at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An out-of-bounds write vulnerability exists in the real-mode hook handler of Bitdefender Napoca, specifically within 'napoca/kernel/handler.c'. The vulnerability stems from a lack of bounds validation on a guest-controlled SS:SP-derived offset used to index the 1MB RealModeMemory buffer. By providing specific register values (SS=0xFFFF, ESP=0xFFFF), an attacker can calculate an offset of 0x10FFEF, which exceeds the buffer by over 65,000 bytes. This allows an IRET frame push to overwrite the hypervisor's heap memory. An attacker with local access to a guest VM can exploit this to achieve arbitrary code execution at the hypervisor level. No patch is available as the product is end-of-life.

## Affected products

- Bitdefender Napoca All versions (End-of-Life)

## Timeline

- 2026-06-02: disclosed
- 2026-06-02: advisory

## References

- [https://www.bitdefender.com/support/security-advisories/out-of-bounds-write-in-napoca-real-mode-hook-handler-via-guest-controlled-sssp-va-13905](https://www.bitdefender.com/support/security-advisories/out-of-bounds-write-in-napoca-real-mode-hook-handler-via-guest-controlled-sssp-va-13905)

## Related threats

- [Bitdefender Napoca out-of-bounds write in BIOS memory map handler](https://junglewise.ai/threats/cve-2026-10046-bitdefender-napoca-out-of-bounds-write-in-bios-memory-map-handler)