---
id: CVE-2026-77372
title: >-
  VeraCrypt: Heap overflow and out-of-bounds read in Serializable
  deserialization (elevated Core service input path)
summary: >-
  VeraCrypt provides disk encryption with strong security based on TrueCrypt.
  Prior to 1.26.30, the Unix, macOS, and FreeBSD serialization paths in
  src/Platform/Serializer.cpp and src/Volume/VolumePassword.cpp accept untrusted
  length and c…
severity: high
cvss: 8.8
cvssVector: 'CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'
cvssSource: cna
cwe:
  - CWE-125
  - CWE-787
vendor: veracrypt
product: VeraCrypt
affected:
  - VeraCrypt < 1.26.30
published: '2026-11-04'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T22:53:57.172Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-77372'
references:
  - url: >-
      https://github.com/veracrypt/VeraCrypt/security/advisories/GHSA-4j3p-7hp7-xw73
    label: >-
      https://github.com/veracrypt/VeraCrypt/security/advisories/GHSA-4j3p-7hp7-xw73
  - url: >-
      https://github.com/veracrypt/VeraCrypt/commit/fb9d96c52dace4d34c5427402b512e8de5f832d6
    label: >-
      https://github.com/veracrypt/VeraCrypt/commit/fb9d96c52dace4d34c5427402b512e8de5f832d6
  - url: 'https://github.com/veracrypt/VeraCrypt/releases/tag/VeraCrypt_1.26.30'
    label: 'https://github.com/veracrypt/VeraCrypt/releases/tag/VeraCrypt_1.26.30'
tags:
  - cve.org
ingestedAt: '2026-11-05T21:36:00.665Z'
epss: 0.00098
epssPercentile: 0.00776
---

## Overview

VeraCrypt provides disk encryption with strong security based on TrueCrypt. Prior to 1.26.30, the Unix, macOS, and FreeBSD serialization paths in src/Platform/Serializer.cpp and src/Volume/VolumePassword.cpp accept untrusted length and count values when deserializing data that can cross from the unprivileged GUI or CLI to the root CoreService helper. Serializer::DeserializeWString allocates floor(size / sizeof(wchar_t)) elements but reads size bytes, so a non-aligned size can overflow the heap allocation. VolumePassword::Deserialize accepts PasswordSize values larger than the fixed 128-byte PasswordBuffer, allowing downstream DataPtr() and Size() consumers such as the KDF to read beyond the buffer. DeserializeString, DeserializeWString, and the string and wide-string list readers also lack allocation and collection bounds, which can exhaust memory, and a zero-length DeserializeString can access an empty vector. Windows uses a different path, and the immediate CoreService pipe writer is the same-user parent process, so the documented exposure is a local defense-in-depth boundary rather than a remote attack. This issue is fixed in 1.26.30.

## Affected

- `VeraCrypt < 1.26.30`

## Remediation

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