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Vulnerabilities

Vulnerability · CVE-2026-2739

This affects versions of the package bn.js before 5.2.3.

Published Feb 20, 2026 · catalog updated Jun 17, 2026 · This affects versions of

Check if you run it

No confirmed exploitation is on record for CVE-2026-2739. EPSS is 0.61%. Act only if a listed version of This affects versions of is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (This affects versions of).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.61%
Remediation
Advisory link
Affected products
See sources for product scope

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.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-2739

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-2739. EPSS is 0.61%. Act only if a listed version of This affects versions of is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-835: Infinite Loop. EPSS 0.61%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 20, 2026 · NIST NVD

    Detected

    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.

  2. Jun 17, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-2739

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-2739

    30-day exploitation probability 0.6%

    first.org
  • NIST NVDVulnerability recordCVE-2026-2739

    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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.