CVE-2026-59874 PUBLISHED

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

Assigner: GitHub_M
Reserved: 07.07.2026 Published: 08.07.2026 Updated: 08.07.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	isaacs
Product	node-tar
Versions	Version < 7.5.18 is affected

References

Problem Types

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') CWE