Dislocker through 0.7.3 Out-of-Bounds Heap Read via VMK/FVEK Datum Size Underflow

Advisories

Dislocker through 0.7.3 Out-of-Bounds Heap Read via VMK/FVEK Datum Size Underflow

severity: medium
date: 10/8/2026
Affecting: dislocker <= 0.7.3
CVE: CVE-2026-107635
CWE: CWE-191 Integer Underflow (Wrap or Wraparound)
CVSS: 6.8
CVSS V4 Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References: Patch Commit
https://github.com/Aorimn/dislocker/blob/v0.7.3/src/metadata/vmk.c#L146-L180
https://github.com/Aorimn/dislocker/blob/v0.7.3/src/metadata/fvek.c#L90-L105
https://github.com/Aorimn/dislocker
Credit: Tristan Madani (@TristanInSec), Talence Security
Description: 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.

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