---
id: CVE-2026-107635
title: >-
  Dislocker through 0.7.3 contains an integer underflow vulnerability in
  get_vmk() and get_fvek() that allows attackers to trigger out-of-bounds heap
  reads via crafted datum sizes
summary: >-
  Dislocker through 0.7.3 contains an integer underflow vulnerability in
  get_vmk() and get_fvek() that allows attackers to trigger out-of-bounds heap
  reads via crafted datum sizes. Attackers can supply a malicious BitLocker
  volume image wi…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'
cwe:
  - CWE-191
vendor: Aorimn
product: dislocker
affected:
  - dislocker <= 0.7.3
published: '2026-10-08'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T12:16:31.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107635'
references:
  - url: 'https://github.com/Aorimn/dislocker'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/Aorimn/dislocker/blob/v0.7.3/src/metadata/fvek.c#L90-L105
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/Aorimn/dislocker/blob/v0.7.3/src/metadata/vmk.c#L146-L180
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/Aorimn/dislocker/commit/0706462db88efe8df88150e4c3e4332b808f4581
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/dislocker-through-0.7.3-out-of-bounds-heap-read-via-vmk-fvek-datum-size-underflow
    label: disclosure@vulncheck.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-107635.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-107635'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-107635'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00127
epssPercentile: 0.02345
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-08T16:05:14.829892Z'
scores:
  nvd: 5.5
  cna: 6.1
ingestedAt: '2026-10-08T14:47:16.357Z'
---

## Overview

Dislocker through 0.7.3 contains an integer underflow vulnerability in get_vmk() and get_fvek() that allows attackers to trigger out-of-bounds heap reads via crafted datum sizes. Attackers can supply a malicious BitLocker volume image with a datum_size smaller than the 36-byte AES-CCM header, causing hexdump() to over-read and crash dislocker.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · updated 2026-10-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-107635.json)