CVE-2026-2739
Publication date 20 February 2026
Last updated 27 February 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| node-bn.js | 26.04 LTS resolute |
Needs evaluation
|
| 25.10 questing |
Needs evaluation
|
|
| 24.04 LTS noble |
Needs evaluation
|
|
| 22.04 LTS jammy |
Needs evaluation
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
Severity score breakdown
CVSS version: CVSS v3.0
Base score
5.3 · Medium
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-2739
- https://security.snyk.io/vuln/SNYK-JS-BNJS-15274301
- https://github.com/indutny/bn.js/issues/316
- https://github.com/indutny/bn.js/issues/186
- https://gist.github.com/Kr0emer/02370d18328c28b5dd7f9ac880d22a91
- https://github.com/indutny/bn.js/pull/317
- https://github.com/indutny/bn.js/commit/33df26b5771e824f303a79ec6407409376baa64b