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CVE-2026-49356

22
FAUCET Score

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.

First published: Jun 22, 2026Last modified: Jun 22, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 7.29.6CPE matchmatch criteria
cpe:2.3:a:babel:babel:*:*:*:*:*:*:*:*
8.0.0CPE matchmatch criteria
cpe:2.3:a:babel:babel:8.0.0:alpha0:*:*:*:*:*:*
8.0.0CPE matchmatch criteria
cpe:2.3:a:babel:babel:8.0.0:alpha1:*:*:*:*:*:*
8.0.0CPE matchmatch criteria
cpe:2.3:a:babel:babel:8.0.0:alpha10:*:*:*:*:*:*
8.0.0CPE matchmatch criteria
cpe:2.3:a:babel:babel:8.0.0:alpha11:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

3.2LOW

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

Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.4
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.13%
Probability of exploitation in next 30 days
EPSS Percentile
2.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0013 is in the 4th percentile among its peer group of 577 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.0 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

npmpatch availablevia ghsa
Product: @babel/coreFixed in: 8.0.0-rc.6
npmpatch availablevia ghsa
Product: @babel/coreFixed in: 7.29.6

Vendor Advisories (2)

npmGHSA-4x5r-pxfx-6jf8low

@babel/core: Arbitrary File Read via sourceMappingURL Comment

Jun 15, 2026
microsoft2026-Jun/CVE-2026-49356Low

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

Jun 9, 2026

References

github.com / babel/babel/security/advisories/GHSA-4x5r-pxfx-6jf8
MitigationVendor Advisory