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.

EPSS: 0.004 (35.2th percentile) — read the EPSS interpretation.

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.

Affected products

Isaacs Node-tar — versions < 7.5.18
Isaacs Tar

Weakness classification (CWE)

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

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC, 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.