CVE-2019-13173: fstream before 1.0.12 is vulnerable to Arbitrary File Overwrite

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HIGH 7.5REMOTEUPGRADE

CVE-2019-13173 is a high-severity flaw (CVSS 7.5) affecting fstream. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

fstream before 1.0.12 is vulnerable to Arbitrary File Overwrite. Extracting tarballs containing a hardlink to a file that already exists in the system, and a file that matches the hardlink, will overwrite the system's file with the contents of the extracted file. The fstream.DirWriter() function is vulnerable.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-59
Published	2019-07-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fstream project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-07-02 20:15 UTCPublished CVE record published
2026-06-17 02:16 UTCUpdated Record last modified

fstream project fstream UPGRADE

Affected: < 1.0.12

Fixed in: 1.0.12

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls fstream

2. UPGRADE to 1.0.12

npm install fstream@">=1.0.12"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-13173?

fstream: upgrade to 1.0.12. Exact commands for each OS are on this page.

Is CVE-2019-13173 being exploited?

CVE-2019-13173 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-13173 affect?

CVE-2019-13173 affects fstream. Severity is high (CVSS 7.5). fstream before 1.0.12 is vulnerable to Arbitrary File Overwrite. Extracting tarballs containing a hardlink to a file that already exists in the system, and a file that matches the hardlink, will overwrite the system's file with the contents

How urgent is CVE-2019-13173?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

References

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