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Vulnerabilities

Vulnerability · MAL-2026-14426

Malicious code in babel-polyfill-plugin-corejs2 (npm)

Published Aug 24, 2026 · catalog updated Oct 14, 2026 · Malicious code in babel-polyfill-plugin-corejs2

Open the advisory

Exploitation likelihood is not on this record for MAL-2026-14426. A missing EPSS score is not a low risk. Compare Malicious code in babel-polyfill-plugin-corejs2 with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Malicious code in babel-polyfill-plugin-corejs2).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Advisory link
Affected products
npm babel-polyfill-plugin-corejs2

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (13878d994b01607c379e26646449b7cca95099f9b2eb5be2e1f8e19aeea32eb3) The package advertises itself as a Babel core-js 2 polyfill plugin, but the shipped lib/index.js contains unrelated web3-core-subscriptions boilerplate followed by a Function() invocation whose body is ~110KB of obfuscated JavaScript (random identifiers, numeric offset arrays, TEA-like mixing routine, unicode-escape string literals). The Function() call executes whenever a consumer require()s the package, running the opaque payload at import time. The declared purpose does not match the shipped code, and the obfuscation is confined to the appended payload rather than being a general minification artifact. ## Source: ghsa-malware (69ae525ab6e1ea4ee1d3d1cbb451a97e4e89072feb3df4c506f51eb14a34dd66) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • npm babel-polyfill-plugin-corejs21.0.1

How to fix MAL-2026-14426

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for MAL-2026-14426. A missing EPSS score is not a low risk. Compare Malicious code in babel-polyfill-plugin-corejs2 with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 1.0.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 24, 2026 · CIRCL Vulnerability Lookup

    Detected

    --- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (13878d994b01607c379e26646449b7cca95099f9b2eb5be2e1f8e19aeea32eb3) The package advertises itself as a Babel core-js 2 polyfill plugin, but the shipped lib/index.js contains unrelated web3-core-subscriptions boilerplate followed by a Function() invocation whose body is ~110KB of obfuscated JavaScript (random ide

  2. Oct 14, 2026 · CIRCL Vulnerability Lookup

    Updated

    --- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (13878d994b01607c379e26646449b7cca95099f9b2eb5be2e1f8e19aeea32eb3) The package advertises itself as a Babel core-js 2 polyfill plugin, but the shipped lib/index.js contains unrelated web3-core-subscriptions boilerplate followed by a Function() invocation whose body is ~110KB of obfuscated JavaScript (random ide

  3. Oct 14, 2026 · GitHub Advisory Database

    Updated

    --- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (13878d994b01607c379e26646449b7cca95099f9b2eb5be2e1f8e19aeea32eb3) The package advertises itself as a Babel core-js 2 polyfill plugin, but the shipped lib/index.js contains unrelated web3-core-subscriptions boilerplate followed by a Function() invocation whose body is ~110KB of obfuscated JavaScript (random ide

Sources

References

Freshness

Last verified in this catalog Oct 14, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.