# CVE-2026-49356: Babel: Arbitrary File Read via sourceMappingURL Comment in @babel/core

CVE-2026-49356 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-49356, released June 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-49356
- Priority: Routine
- CVSS: 3.6 (Low)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 22, 2026
- Weakness: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49356

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | agama-web-ui opensuse-leap 16.0 | 17+673.b97ba64d6-160000.12.1 | [OPENSUSE-SU-2026:21448-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21448-1.md) | Jul 27, 2026 |
| Linux | node-babel7 Debian 14 | 8.0.4+ds1+~cs177.303.116-2 | [DEBIAN-CVE-2026-49356](https://patchblox.com/security/data/fix/linux/debian-cve-2026-49356.md) | Jun 22, 2026 |

---

Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.