CVE-2026-2739 PUBLISHED

Assigner: snyk
Reserved: 19.02.2026 Published: 20.02.2026 Updated: 20.02.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	n/a
Product	bn.js
Versions	affected from 0 to 5.2.3 (excl.)

Credits

Kr0emer

References

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

Problem Types

Infinite loop