CVE-2026-2739
Medium
Description
This affects versions of the package bn.js before 5.2.3. 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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductBn.js
PublishedFeb 20, 2026
First seenFeb 20, 2026
Weakness typeCWE-835CWE-835
How to fix
Update
- bn.js4.12.3, 5.2.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| bn.jsnpm | v < 4.12.3, 5.0.0 ≤ v < 5.2.3 | 4.12.3, 5.2.3 |
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