CVE-2026-49356

Babel: Arbitrary File Read via sourceMappingURL Comment in @babel/core

State: Published
Severity: 3.2 Low
Published: Jun 22, 2026
Updated: Jun 22, 2026
Reserved: May 29, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	3.2 Low	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N	GitHub_M

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Affected Products

Product	Versions
babelbabel	>= 8.0.0-alpha.0, < 8.0.0-rc.5Affected < 7.29.6Affected

References

https://github.com/babel/babel/security/advisories/GHSA-4x5r-pxfx-6jf8

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