All the vulnerabilities related to the version 0.13.0 of the package
Uncaught Exception in bignum
All versions of the npm package bignum are vulnerable to Denial of Service (DoS) due to a type-check exception in V8. When verifying the type of the second argument to the .powm function, V8 will crash regardless of Node try/catch blocks.
Malware in pre-build binaries of bignum
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.
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.