Low
Babel: Arbitrary File Read via sourceMappingURL Comment in @babel/core
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-49356
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 05:45 UTC · Revision 1
Source evidence
Babel: Arbitrary File Read via sourceMappingURL Comment in @babel/core
core-osv · Original sourcePublished 22 Jun 2026, 16:07 UTC
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.
osv:CVE-2026-49356
Complete source record
{
"id": "f43eefba43e17694a6625d9c144d87f90bce110696f7f4874c90216357ff2556",
"url": "https://osv.dev/vulnerability/CVE-2026-49356",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Babel: Arbitrary File Read via sourceMappingURL Comment in @babel/core",
"summary": "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.",
"evidence": "osv:CVE-2026-49356",
"products": [],
"severity": "low",
"structured": {
"id": "CVE-2026-49356",
"aliases": [
"CVE-2026-49356",
"GHSA-4x5r-pxfx-6jf8"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/babel/babel",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "04ea6b27fdac8f40c3481aec2080ac9678779509"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:babel:babel:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "7.29.6"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49356.json"
}
}
],
"modified": "2026-10-28T02:30:42.999304724Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49356.json",
"https://github.com/babel/babel/security/advisories/GHSA-4x5r-pxfx-6jf8",
"https://nvd.nist.gov/vuln/detail/CVE-2026-49356"
],
"provider_metadata": {
"cwe_ids": [
"CWE-200",
"CWE-22"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49356.json"
}
},
"related_cves": [
{
"value": "CVE-2026-49356",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 510813,
"published_at": "2026-06-22T16:07:01.764+00:00"
}