GHSA-4x5r-pxfx-6jf8

Source

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

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-4x5r-pxfx-6jf8/GHSA-4x5r-pxfx-6jf8.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-4x5r-pxfx-6jf8

Aliases

CVE-2026-49356

Downstream

CGA (232)

MINI (13)

Published

2026-06-15T17:14:14Z

Modified

2026-09-10T03:50:48Z

Severity

3.2 (Low) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N CVSS Calculator

Summary

@babel/core: Arbitrary File Read via sourceMappingURL Comment

Details

Impact

Using @babel/core to compile maliciously crafted code can allow ab attacker to read any source map from the system that is running Babel, if these conditions are all true:

the attacker controls the input source code
the attacker can read the output source code
the attacker knows the path of the source map file that they want to read

Users that only compile trusted code are not impacted.

Patches

The vulnerability has been fixed in @babel/core@7.29.6 and @babel/core@8.0.0-rc.6.

Workarounds

Callers can mitigate the issue without upgrading by setting inputSourceMap: false in their Babel options.

Callers can also manually extract the #sourceMappingURL comment from the input source code, validate whether the source map that it links to is allowed to be read, and if it is pass an object to inputSourceMap (passing false when it's not).

Credits

Thanks Teodor-Cristian Radoi for reporting the vulnerability.

Database specific

{
    "cwe_ids":  [
        "CWE-200",
        "CWE-22"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-06-15T17:14:14Z",
    "nvd_published_at":  "2026-06-22T18:16:41Z",
    "severity":  "LOW"
}

References

Affected packages

npm / @babel/core

Package

Name: @babel/core; View open source insights on deps.dev
Purl: pkg:npm/%40babel/core

Affected ranges

Type: SEMVER
Events: Introduced

8.0.0-alpha.0

Fixed

8.0.0-rc.6

Database specific

last_known_affected_version_range

"< 8.0.0-rc.5"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-4x5r-pxfx-6jf8/GHSA-4x5r-pxfx-6jf8.json"