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.
CVE-2026-2739 is fixed in node-bn.js on 1 platform by DEBIAN-CVE-2026-2739 (version 5.2.3+~5.2.0-1), released February 20, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| node-bn.js · Debian 14 | 5.2.3+~5.2.0-1 | DEBIAN-CVE-2026-2739 | Feb 20, 2026 |
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