CVE-2026-49356

Arbitrary file read via unchecked sourceMappingURL path

Published Jun 22, 2026 · Updated Jun 22, 2026

Path traversal in @babel/core before 7.29.6 and 8.0.0-alpha.0 through 8.0.0-rc.5 allows attackers to read local source maps. The input source-map loader follows a path from an untrusted sourceMappingURL comment without first restricting which local map file may be loaded. Exploitation requires control of compiler input, knowledge of the target map path, and access to the generated output; trusted-only compilation is unaffected.

CVSS severity3.2
Low
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in @babel/core before 7.29.6 and 8.0.0-alpha.0 through 8.0.0-rc.5 allows attackers to read local source maps. The input source-map loader follows a path from an untrusted sourceMappingURL comment without first restricting which local map file may be loaded. Exploitation requires control of compiler input, knowledge of the target map path, and access to the generated output; trusted-only compilation is unaffected.

The record

CVE
CVE-2026-49356
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
Babel
Product
Babel
Classifications
CWE-200, CWE-22, T1005
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 7.29.6
  2. Affected versionversion=>= 8.0.0-alpha.0, < 8.0.0-rc.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Babel · Babelversion=< 7.29.6; version=>= 8.0.0-alpha.0, < 8.0.0-rc.5

Published CVSS scores

3.2GitHubCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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