What is CVE-2026-59871?

CVE-2026-59871 is a medium-severity vulnerability in Isaacs Node-Tar, classified under Incorrect Type Conversion or Cast. CVSS score: 5.3/10. Published 2026-07-08.

How severe is CVE-2026-59871?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Isaacs Node-Tar

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.

Published 2026-07-08 · last modified 2026-07-10.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.006 (49.3th percentile), scored 2026-10-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Isaacs Node-Tar — versions < 7.5.18
Isaacs Tar

Weakness classification (CWE)

CWE-704 — Incorrect Type Conversion or Cast

References

github.com/isaacs/node-tar/security/advisories/GHSA-w8wr-v893-vjvp (Exploit, Vendor Advisory)
github.com/isaacs/node-tar/commit/e02a4e9e013c4be95302e2eb2047a942b883c27b (Patch)
github.com/isaacs/node-tar/releases/tag/v7.5.18 (Release Notes)

Frequently asked questions

What is CVE-2026-59871?: CVE-2026-59871 is a medium-severity vulnerability in Isaacs Node-Tar, classified under Incorrect Type Conversion or Cast. CVSS score: 5.3/10. Published 2026-07-08.
How severe is CVE-2026-59871?: Medium severity. CVSS v3 base score is 5.3 out of 10.