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

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-59874 · Microsoft / collected KEV context

EUVD-2026-42306

GHSA-8x88-c5mf-7j5w

cve-program · CVE-2026-59874

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

euvd · EUVD-2026-42306

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

nvd · CVE-2026-59874

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

osv · GHSA-8x88-c5mf-7j5w

• https://github.com/isaacs/node-tar/security/advisories/GHSA-8x88-c5mf-7j5w
• https://nvd.nist.gov/vuln/detail/CVE-2026-59874
• https://github.com/isaacs/node-tar/commit/9e78bf058b2c22dd4d52e00d8922d5c06fc2f7b5
• https://github.com/isaacs/node-tar
• https://github.com/isaacs/node-tar/releases/tag/v7.5.18

• 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 parsi… · Advisory content revised · 1 Nov 2026