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Unratedamended

Malware in pre-build binaries of bignum

GHSA-7cgc-fjv4-52x6

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (bignum 0.13.1), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm bignum

    Affected
    >= 0.12.2, < 0.13.1
    Fixed in
    0.13.1

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
not scored
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Impact bignum releases from v0.12.2 to v0.13.0 (inclusive) used node-pre-gyp to optionally download pre-built binary versions of the addon. These binaries were published on a now-expired S3 bucket which has since been claimed by a malicious third party which is now serving binaries containing malware that exfiltrates data from the user's computer. Patches v0.13.1 does not use node-pre-gyp and does not have support for downloading pre-built binaries in any form, avoiding the risk of malicious downloads.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-7cgc-fjv4-52x6

  2. Revision 1 · created ·

    Published from osv record GHSA-7cgc-fjv4-52x6

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: GHSA-7cgc-fjv4-52x6

Advisory: Malware in pre-build binaries of bignum
IDs: GHSA-7cgc-fjv4-52x6
Record: https://patchnext.com/advisories/ghsa-7cgc-fjv4-52x6 (revision 2, source checked 26 Oct 2026, 12:22 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: bignum 0.13.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm bignum: affected >= 0.12.2, < 0.13.1; fixed in 0.13.1

## Suggested inspection (read-only)
- `npm ls bignum --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on bignum.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-7cgc-fjv4-52x6 (OSV record GHSA-7cgc-fjv4-52x6 lists affected ranges: npm bignum >=0.12.2 <0.13.1 (fixed))
- Verified: https://github.com/advisories/GHSA-7cgc-fjv4-52x6 (GitHub-reviewed advisory GHSA-7cgc-fjv4-52x6 lists affected ranges: npm bignum >=0.12.2 <0.13.1)

Commands are suggestions: review each one before running it.

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