CVE-2018-1002203: unzipper npm library before 0.8.13 is vulnerable to directory traversal, allowing attackers to write to arbitr

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MEDIUM 5.5UPGRADE

CVE-2018-1002203 is a medium-severity flaw (CVSS 5.5) affecting unzipper. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

unzipper npm library before 0.8.13 is vulnerable to directory traversal, allowing attackers to write to arbitrary files via a ../ (dot dot slash) in a Zip archive entry that is mishandled during extraction. This vulnerability is also known as 'Zip-Slip'.

Why this priority

EPSS top 4%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	10.6% (top 4%)
CISA exploited list	No
Weakness	CWE-22
Published	2018-07-25
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: unzipper project

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

Am I affected?

Timeline

2018-07-25 17:29 UTCPublished CVE record published
2026-06-17 01:33 UTCUpdated Record last modified

unzipper project unzipper UPGRADE

Affected: < 0.8.13

Fixed in: 0.8.13

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls unzipper

2. UPGRADE to 0.8.13

npm install unzipper@">=0.8.13"

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-2018-1002203?

unzipper: upgrade to 0.8.13. Exact commands for each OS are on this page.

Is CVE-2018-1002203 being exploited?

CVE-2018-1002203 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-2018-1002203 affect?

CVE-2018-1002203 affects unzipper. Severity is medium (CVSS 5.5). unzipper npm library before 0.8.13 is vulnerable to directory traversal, allowing attackers to write to arbitrary files via a ../ (dot dot slash) in a Zip archive entry that is mishandled during extraction. This vulnerability is also known

How urgent is CVE-2018-1002203?

Priority 48/100. EPSS top 4%: very likely to be exploited; Public exploit reference

References

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