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CVE-2026-59874— node-tar: Negative tar entry size causes infinite loop in archive replace

Quick assessment

Affected
isaacs node-tar
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

isaacs node-tar是isaacs个人开发者开源的一款用于文件压缩/解压缩的软件包。 isaacs node-tar 7.5.18之前版本存在资源管理错误漏洞，该漏洞源于tar.replace函数接受具有负base-256编码条目大小的校验有效tar标头，导致存档扫描器反复解析同一标头而无法继续处理。

AI Predicted 7.5 Difficulty: Easy EPSS 0.64% · P49

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
isaacs node-tar < 7.5.18 affected
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I. Basic Information for CVE-2026-59874

Vulnerability Information
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Vulnerability Title
node-tar: Negative tar entry size causes infinite loop in archive replace
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
isaacs node-tar 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
isaacs node-tar是isaacs个人开发者开源的一款用于文件压缩/解压缩的软件包。 isaacs node-tar 7.5.18之前版本存在资源管理错误漏洞，该漏洞源于tar.replace函数接受具有负base-256编码条目大小的校验有效tar标头，导致存档扫描器反复解析同一标头而无法继续处理。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
isaacs node-tar < 7.5.18 -

II. Public POCs for CVE-2026-59874

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III. Intelligence Information for CVE-2026-59874

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Patches & Fixes for CVE-2026-59874 (1)

Vendor Advisories for CVE-2026-59874 (1)

Vendor Pages for CVE-2026-59874 (1)

Same Patch Batch · isaacs · 2026-07-08 · 4 CVEs total

CVE-2026-59875 5.3 MEDIUM node-tar: Uncaught Exception DoS via NUL byte in PAX path/linkpath records
CVE-2026-59871 5.3 MEDIUM node-tar: Process crash via PAX numeric path type confusion
CVE-2026-59873 node-tar: Decompression/parse DoS via unlimited input

IV. Related Vulnerabilities

Same product: node-tar
Same vendor: isaacs
Same weakness: CWE-835

V. Comments for CVE-2026-59874

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