SB2026030560 - Infinite loop in bn.js
Published: March 5, 2026
Security Bulletin ID
SB2026030560
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Infinite loop (CVE-ID: CVE-2026-2739)
CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
CVSSv4: 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:U/U:Green
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to infinite loop. A remote attacker can сall 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.
Remediation
Install update from vendor's website.
References
- https://gist.github.com/Kr0emer/02370d18328c28b5dd7f9ac880d22a91
- https://github.com/indutny/bn.js/commit/33df26b5771e824f303a79ec6407409376baa64b
- https://github.com/indutny/bn.js/issues/186
- https://github.com/indutny/bn.js/issues/316
- https://github.com/indutny/bn.js/pull/317
- https://security.snyk.io/vuln/SNYK-JS-BNJS-15274301