CVE-2026-59874 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-59874HIGH

isaacs node-tar — node-tar: Negative tar entry size causes infinite loop in archive replace

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   N   N   N   H    8.7   .0042   35.0     —

AFFECTED
  Product   Versions    Fixed
  node-tar  < 7.5.18 –  —

TIMELINE
  Jul 7   Reserved by GitHub_M
  Jul 8   EXPLOIT PUBLISHED — CVE-2026-59874 (isaacs node-tar). Public exploit reference added.
  Jul 8   Published (CNA: GitHub_M)

CWE-835 · CNA: GitHub_M · CVSS v4.0 · 3 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 7, 2026	Reserved	Reserved by GitHub_M
July 8, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-59874 (isaacs node-tar). Public exploit reference added.
July 8, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
isaacs	node-tar	—	< 7.5.18	—

Weaknesses

CWE-835

References (3)

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]

Authoritative record: CVE-2026-59874 at cve.org

Vendors: isaacs

Weaknesses: CWE-835

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-59874 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.