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CVE-2026-49356— Babel: Arbitrary File Read via sourceMappingURL Comment in @babel/core

Quick assessment

Affected
babel babel
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.

Babel是Babel组织开源的一个 JavaScript 的编译器。 Babel存在安全漏洞，该漏洞源于sourceMappingURL注释可导致任意文件读取，使得攻击者能够读取运行Babel系统的任意源映射文件。

CVSS 3.2 · Low EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 2

VendorProduct Version RangeStatus
babel babel >= 8.0.0-alpha.0, < 8.0.0-rc.5 affected
< 7.29.6 affected
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I. Basic Information for CVE-2026-49356

Vulnerability Information
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Vulnerability Title
Babel: Arbitrary File Read via sourceMappingURL Comment in @babel/core
Source: CVE Program / CVE List V5
Vulnerability Description
Babel is a compiler for writing next generation JavaScript. Prior to 8.0.0-rc.6 and 7.29.6, @babel/core affected by an arbitrary file read via a sourceMappingURL comment. Using @babel/core to compile maliciously crafted code can allow an attacker to read any source map from the system that is running Babel, if the attacker controls the input source code, can read the output source code, and knows the path of the source map file that they want to read. This vulnerability is fixed in 8.0.0-rc.6 and 7.29.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Babel 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Babel是Babel组织开源的一个 JavaScript 的编译器。 Babel存在安全漏洞，该漏洞源于sourceMappingURL注释可导致任意文件读取，使得攻击者能够读取运行Babel系统的任意源映射文件。
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
babel babel >= 8.0.0-alpha.0, < 8.0.0-rc.5 -

II. Public POCs for CVE-2026-49356

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III. Intelligence Information for CVE-2026-49356

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Vendor Advisories for CVE-2026-49356 (1)

IV. Related Vulnerabilities

Same product: babel
Same vendor: babel
Same weakness: CWE-22

V. Comments for CVE-2026-49356

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