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

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.

Scores

EPSS (exploitation in 30 days)

0.12% · top 98% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.5.

Weakness

• CWE-787: Out-of-bounds Write (opens in a new tab)All about CWE-787 and its CVEs

Affected products

• Bitdefender · Napoca bare-metal hypervisor

  • affected all

What to do

Solution: No fix is planned because Bitdefender Napoca is end-of-life. Users should discontinue use of the unsupported product.

Workaround: No workaround is available.

References (1)

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

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-10047](https://trackcve.app/badge/CVE-2026-10047.svg)](https://trackcve.app/cve/CVE-2026-10047)

Record last updated 2 Jun 2026, 16:06 UTC.