High 8.7Published Jul 8, 2026

CVE-2026-59874node-tar: Negative tar entry size causes infinite loop in archive replace

Updated under an hour ago (Oct 27, 2026, 3:00 PM ET)

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Every CVE for isaacs node-tar

Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-835
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

isaacs node-tar isaacs:node_tar (from the name)	before 7.5.18	CNA record
isaacs tar isaacs:tar	before 7.5.18	NVD

References

References

https://github.com/isaacs/node-tar/security/advisories/GHSA-8x88-c5mf-7j5w	x-refsource-confirm, exploit, vendor-advisory
https://github.com/isaacs/node-tar/commit/9e78bf058b2c22dd4d52e00d8922d5c06fc2f7b5	x-refsource-misc, patch
https://github.com/isaacs/node-tar/releases/tag/v7.5.18	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.