How severe is CVE-2026-2739?

CVE-2026-2739 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-2739 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-2739?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-2739 have an EU (EUVD) identifier?

Yes. CVE-2026-2739 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8025.

When was CVE-2026-2739 published?

CVE-2026-2739 was published on 2026-02-20 and last updated on 2026-06-17.

CVE-2026-2739

CVE-2026-2739 is a medium-severity vulnerability with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-835.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 5.5
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8025
Weakness: CWE-835
Published: 2026-02-20
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-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.
How severe is CVE-2026-2739?: CVE-2026-2739 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-2739 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-2739?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-2739 have an EU (EUVD) identifier?: Yes. CVE-2026-2739 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8025.
When was CVE-2026-2739 published?: CVE-2026-2739 was published on 2026-02-20 and last updated on 2026-06-17.

References

Other CWE-835 (Loop with Unreachable Exit Condition (Infinite Loop)) vulnerabilities

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CVE-2017-12997 — Critical (CVSS 9.8): The LLDP parser in tcpdump before 4.9.2 could enter an infinite loop due to a bug in…
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CVE-2017-12990 — Critical (CVSS 9.8): The ISAKMP parser in tcpdump before 4.9.2 could enter an infinite loop due to bugs in print-isakmp.c, several functions.
CVE-2026-31448 — Critical (CVSS 9.4): In the Linux kernel, the following vulnerability has been resolved: ext4: avoid infinite loops caused by residual…

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