CVE-2026-59874node-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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

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