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

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Summary

CVECVE-2026-49356
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-22 18:16:41 UTC
Updated2026-06-22 19:17:03 UTC
DescriptionBabel 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.

Risk And Classification

Primary CVSS: v3.1 3.2 LOW from [email protected]

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.2LOWCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
3.1CNADECLARED3.2LOWCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Babel Babel affected >= 8.0.0-alpha.0, < 8.0.0-rc.5 Not specified
CNA Babel Babel affected < 7.29.6 Not specified

References

ReferenceSourceLinkTags
github.com/babel/babel/security/advisories/GHSA-4x5r-pxfx-6jf8 [email protected] github.com
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