What is CVE-2026-59874?

CVE-2026-59874 is a high-severity vulnerability in Isaacs Node-Tar, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-07-08.

How severe is CVE-2026-59874?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Isaacs Node-Tar

CVE-2026-59874

node-tar is a tar archive manipulation library for Node.js. Prior to 7.5.18, tar.replace accepts a checksum-valid tar header with a negative base-256 encoded entry size, causing the archive scanner to make no progress while repeatedly parsing the same header. 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 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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: 0.004 · newest: 0.006 · change: +0.002

Affected products

Isaacs Node-Tar — versions < 7.5.18
Isaacs Tar

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

github.com/isaacs/node-tar/security/advisories/GHSA-8x88-c5mf-7j5w (Exploit, Vendor Advisory)
github.com/isaacs/node-tar/commit/9e78bf058b2c22dd4d52e00d8922d5c06fc2f7b5 (Patch)
github.com/isaacs/node-tar/releases/tag/v7.5.18 (Release Notes)

Frequently asked questions

What is CVE-2026-59874?: CVE-2026-59874 is a high-severity vulnerability in Isaacs Node-Tar, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-07-08.
How severe is CVE-2026-59874?: High severity. CVSS v3 base score is 7.5 out of 10.