CVE-2026-59871: tar — Exploit & Fix

Description

node-tar is a tar archive manipulation library for Node.js. Prior to 7.5.18, node-tar coerces all-digit PAX path and linkpath values in src/pax.ts to JavaScript numbers, causing downstream path handling such as normalizeWindowsPath(entry.path).split('/') to throw an uncaught TypeError. This issue is fixed in version 7.5.18.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS — Exploit Prediction

0.0036

Probability of exploitation

0.28%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-704 CWE-704

Affected Products

Vendor	Product	Versions
isaacs	tar	< 7.5.18

References

Advisories & Patches

https://github.com/isaacs/node-tar/commit/e02a4e9e013c4be95302e2eb2047a942b883c27b https://github.com/isaacs/node-tar/security/advisories/GHSA-w8wr-v893-vjvp https://github.com/isaacs/node-tar/security/advisories/GHSA-w8wr-v893-vjvp

Exploits

https://github.com/isaacs/node-tar/security/advisories/GHSA-w8wr-v893-vjvp https://github.com/isaacs/node-tar/security/advisories/GHSA-w8wr-v893-vjvp

Other References

https://github.com/isaacs/node-tar/releases/tag/v7.5.18

Frequently Asked Questions

What is CVE-2026-59871? +

node-tar is a tar archive manipulation library for Node.js. Prior to 7.5.18, node-tar coerces all-digit PAX path and linkpath values in src/pax.ts to JavaScript numbers, causing downstream path handling such as normalizeWindowsPath(entry.path).split('/') to throw an uncaught TypeError. This issue is fixed in version 7.5.18. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-59871? +

CVE-2026-59871 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0036, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-59871? +

CVE-2026-59871 affects products from isaacs, specifically: tar. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-59871? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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