CVE-2026-59874
node-tar: Negative tar entry size causes infinite loop in archive replace
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.
INFO
Published Date :
July 8, 2026, 4:16 p.m.
Last Modified :
July 10, 2026, 6:54 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update the node-tar library to version 7.5.18.
- Ensure the library is maintained with the latest security patches.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-59874.
| URL | Resource |
|---|---|
| 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 | Exploit Vendor Advisory |
| https://github.com/isaacs/node-tar/security/advisories/GHSA-8x88-c5mf-7j5w | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-59874 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-59874
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-59874 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-59874 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 10, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:isaacs:tar:*:*:*:*:*:node.js:*:* versions up to (excluding) 7.5.18 Added Reference Type GitHub, Inc.: https://github.com/isaacs/node-tar/commit/9e78bf058b2c22dd4d52e00d8922d5c06fc2f7b5 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/isaacs/node-tar/releases/tag/v7.5.18 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/isaacs/node-tar/security/advisories/GHSA-8x88-c5mf-7j5w Types: Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/isaacs/node-tar/security/advisories/GHSA-8x88-c5mf-7j5w Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 08, 2026
Action Type Old Value New Value Added Reference https://github.com/isaacs/node-tar/security/advisories/GHSA-8x88-c5mf-7j5w Added SSVC {'id': 'CVE-2026-59874', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-08T16:51:08.126808Z'} -
New CVE Received by [email protected]
Jul. 08, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'isaacs', 'product': 'node-tar', 'versions': [{'status': 'affected', 'version': '< 7.5.18'}]}] Added 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. Added CVSS V4.0 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:X/V:X/RE:X/U:X Added CWE CWE-835 Added Reference https://github.com/isaacs/node-tar/commit/9e78bf058b2c22dd4d52e00d8922d5c06fc2f7b5 Added Reference https://github.com/isaacs/node-tar/releases/tag/v7.5.18 Added Reference https://github.com/isaacs/node-tar/security/advisories/GHSA-8x88-c5mf-7j5w