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Fencer Intel
high 7.4

CVE-2026-56135 json

Heap buffer overflow in build_inherited_id()

published 3mo ago modified 28d ago also EUVD-2026-65147 , GHSA-c9qg-fh4v-mq8r

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository tuxera/ntfs-3g. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
7.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

In NTFS-3G through 2026.2.25, a heap-based buffer overflow exists in the function build_inherited_id() in libntfs-3g/security.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 by creating a file in a crafted directory.

Patch / fix

  • tuxera ntfs-3g 2026.7.7
  • ntfs-3g Debian 12 1:2022.10.3-1+deb12u4
  • ntfs-3g Debian 13 1:2022.10.3-5+deb13u2
  • ntfs-3g Debian 14 1:2026.7.7-2

debian advisories DEBIAN-CVE-2026-56135

  • ntfs-3g Ubuntu 22.04 LTS 1:2021.8.22-3ubuntu1.4
  • ntfs-3g Ubuntu 24.04 LTS 1:2022.10.3-1.2ubuntu3.2
  • ntfs-3g Ubuntu 26.04 LTS 1:2022.10.3-5ubuntu1.1

ubuntu advisories UBUNTU-CVE-2026-56135

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ntfs-3g_ntfsprogs SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 +1 more 2022.5.17-150000.3.27.1
  • ntfs-3g_ntfsprogs SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 2022.5.17-5.23.1

suse advisories SUSE-SU-2026:3214-1SUSE-SU-2026:3213-1

  • ntfs-3g_ntfsprogs openSUSE Leap 16.0 2022.10.3-160000.4.1
  • ntfs-3g_ntfsprogs openSUSE Tumbleweed 2022.10.3-8.1

opensuse advisories openSUSE-SU-2026:21484-1openSUSE-SU-2026:11320-1

  • ntfs-3g Azure Linux 3.0 2022.10.3-4

azure linux advisories AZL-97932

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-56135 updated cvss 8.8

ntfs-3g: NTFS-3G: Heap memory corruption via malicious NTFS image

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2mo ago

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.4 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 7.4 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of tuxera/ntfs-3g published their own advisory on GitHub. Reviewed sources take precedence over it.