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CVE-2026-54073

VeraCrypt: Hidden volume quick format weakens plausible deniability

MEDIUM
4.6
CVSS Score
Published: August 21, 2026 at 06:51 PM UTC
Updated: October 14, 2026 at 07:10 PM UTC
1 product affected across 1 vendorVeraCrypt

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Severity
MEDIUM4.6
Exploit prediction
EPSS 0.1%
SSVC
PoC

Description

VeraCrypt provides disk encryption with strong security based on TrueCrypt. From 1.26.6 until 1.26.29, file-hosted hidden volume creation forces quick format and the FormatNoFs function in src/Common/Format.c and FormatFat function in src/Common/Fat.c use WriteFile to place raw zeroed sectors at predictable 128 MiB intervals. These writes bypass the normal EncryptDataUnits formatting path, leaving deterministic plaintext markers in an area expected to resemble random ciphertext. The markers can weaken plausible deniability during forensic inspection, although they do not disclose hidden-volume content or reduce the strength of VeraCrypt encryption. This issue is fixed in version 1.26.29.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

VeraCrypt· Veracrypt
90%
>= 1.26.6, < 1.26.29
Affected range stops below 1.26.29, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

x_refsource_CONFIRM
Source: cverecord
https://github.com/veracrypt/VeraCrypt/security/advisories/GHSA-jjcr-75w7-58jp
x_refsource_MISC
Source: cverecord
https://github.com/veracrypt/VeraCrypt/commit/689a59cd584f090ca5f9214d5f2f3a9eac499e53
x_refsource_MISC
Source: cverecord
https://github.com/veracrypt/VeraCrypt/releases/tag/VeraCrypt_1.26.29

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.6MEDIUMGitHub_M
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-693

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