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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.

🗓️ 25 Feb 2026 09:03:52Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 4 Views

bn.js versions before 5.2.3: maskn(0) corrupts state and causes toString and divmod to loop.

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Vulners
Node
microsoftcbl2_reaper_3.1.1-22Range<3.1.1-23

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02 Apr 2026 08:37Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.15.3
CVSS 46.9
EPSS0.00467
SSVC
bn.jsmaskn zeroversion before 5.2.3toString loopdivmod infinite
4