CVE-2026-40706HIGH 8.4EPSS p6.0%

CVE-2026-40706CVE-2026-40706

Description

In NTFS-3G 2022.10.3 before 2026.2.25, a heap buffer overflow exists in ntfs_build_permissions_posix() in acls.c that allows an attacker to corrupt heap memory in the SUID-root ntfs-3g binary by crafting a malicious NTFS image. The overflow is triggered on the READ path (stat, readdir, open) when processing a security descriptor with multiple ACCESS_DENIED ACEs containing WRITE_OWNER from distinct group SIDs.

Scoring

CVSS 3.18.4 (HIGH)
VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.17% probability of exploitation · percentile 6.0% · 2026-06-19T12:03:05Z
Published2026-04-21
Last modified2026-04-22

Underlying weaknesses· 1

CWE-122

References

  1. https://github.com/tuxera/ntfs-3g/blob/d3ace19838ce37cfde55294e76841e6d2f393f9e/libntfs-3g/acls.c#L4011-L4027
  2. https://github.com/tuxera/ntfs-3g/releases/tag/2026.2.25
  3. https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-4cwv-5285-63v9
  4. https://www.openwall.com/lists/oss-security/2026/04/21/4
  5. http://www.openwall.com/lists/oss-security/2026/04/21/4
  6. https://lists.debian.org/debian-lts-announce/2026/04/msg00024.html

1

TypeTargetConfidenceTier
WeaknessHeap-based Buffer Overflowcwe-1220%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.