# DEBIAN-CVE-2026-2739: node-bn.js security update

DEBIAN-CVE-2026-2739, released February 20, 2026, fixes 1 CVE in node-bn.js (version 5.2.3+~5.2.0-1). None of them is reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/fix/linux/debian-cve-2026-2739
- Platform: Linux
- Released: Feb 20, 2026
- Priority: Routine (Closes CVE-2026-2739)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://security-tracker.debian.org/tracker/CVE-2026-2739

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [node-bn.js](https://patchblox.com/security/data/product/linux/node-bn.js.md) | Debian 14 | 5.2.3+~5.2.0-1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-2739](https://patchblox.com/security/data/cve/CVE-2026-2739.md) | 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. | n/a | 0.0053 |  |

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Data as of 2026-11-09T13:31:49Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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