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Advisory severityLow3.6Red Hat Linux

Low [CVE-2026-49356] @babel/core: @babel/core: Arbitrary file read via sourceMappingURL comment

This low-severity Red Hat Linux advisory covers CVE-2026-49356.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-49356 Source published Source updated

VulniPulse record published Record updated

CVE-2026-49356
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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.

Red Hat rates this issue as having Low impact for Red Hat AI products. @babel/core is bundled only in build-time or developer UI tooling (dashboard, model registry, MLflow) and the arbitrary file read requires local access and attacker-controlled source map processing that is not exposed in normal production use.

Red Hat severity: Low — CVSS 3.6 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N). Weakness: CWE-22.

Is CVE-2026-49356 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-49356 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-49356?

Upgrade to a fixed release named by Red Hat:

  • 8.0.0
  • 7.29.6

Confirm against the vendor advisory before you patch.

Affected versions
  • < 8.0.0-rc
  • < 7.29.6

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Fixed versions
  • 8.0.0
  • 7.29.6

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Do not process untrusted source maps with @babel/core in production services. Restrict access to developer UI components.

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

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