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Vulnerability record · CVE-2026-59874 · published 8 July 2026

CVE-2026-59874: Isaacs tar vulnerability

Isaacs · Tar

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.

8.7 CVSS 4.0 High EPSS 0.64% · top 51.2% CWE-835 · CWE-835
8.7CVSS 4.0 base score
0.64%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
10 Jul 2026Last modified by NVD

Description

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/isaacs/node-tar/commit/9e78bf058b2c22dd4d52e00d8922d5c06fc2f7b5 Patch
https://github.com/isaacs/node-tar/releases/tag/v7.5.18 Release Notes
https://github.com/isaacs/node-tar/security/advisories/GHSA-8x88-c5mf-7j5w ExploitVendor Advisory
https://github.com/isaacs/node-tar/security/advisories/GHSA-8x88-c5mf-7j5w ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.2CVE-2026-59873Isaacs tar allocation without limits vulnerabilitynode-tar is a tar archive manipulation library for Node.js. Prior to 7.5.19, node-tar does not enforce hard upper bounds on total decompressed data, …EPSS 0.64%8.2CVE-2026-31802Isaacs tar path traversal vulnerabilitynode-tar is a full-featured Tar for Node.js. Prior to version 7.5.11, tar (npm) can be tricked into creating a symlink that points outside the extrac…EPSS 0.18%8.2CVE-2026-29786Isaacs tar path traversal vulnerabilitynode-tar is a full-featured Tar for Node.js. Prior to version 7.5.10, tar can be tricked into creating a hardlink that points outside the extraction …EPSS 0.39%8.2CVE-2026-24842Isaacs tar path traversal vulnerabilitynode-tar,a Tar for Node.js, contains a vulnerability in versions prior to 7.5.7 where the security check for hardlink entries uses different path res…EPSS 0.62%8.2CVE-2026-23745Isaacs tar path traversal vulnerabilitynode-tar is a Tar for Node.js. The node-tar library (<= 7.5.2) fails to sanitize the linkpath of Link (hardlink) and SymbolicLink entries when preser…EPSS 0.38%7.5CVE-2026-59871Isaacs tar vulnerabilitynode-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…EPSS 0.64%7.5CVE-2018-20834Isaacs tar link following vulnerabilityA vulnerability was found in node-tar before version 4.4.2 (excluding version 2.2.2). An Arbitrary File Overwrite issue exists when extracting a tarb…EPSS 3.1%7.1CVE-2026-26960Isaacs tar path traversal vulnerabilitynode-tar is a full-featured Tar for Node.js. When using default options in versions 7.5.7 and below, an attacker-controlled archive can create a hard…EPSS 0.20%

Source: NIST National Vulnerability Database (record CVE-2026-59874), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.