bn.js up to 5.2.2 toString/divmod infinite loop

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability was found in bn.js up to 5.2.2. It has been declared as problematic. This affects the function toString/divmod. Executing a manipulation can lead to infinite loop. This vulnerability is registered as CVE-2026-2739. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in bn.js up to 5.2.2 and classified as problematic. This vulnerability affects the function toString/divmod. The manipulation with an unknown input leads to a infinite loop vulnerability. The CWE definition for the vulnerability is CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at security.snyk.io. This vulnerability was named CVE-2026-2739 since 02/19/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 299679 (Linux Distros Unpatched Vulnerability : CVE-2026-2739), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.2.3 eliminates this vulnerability. Applying the patch 33df26b5771e824f303a79ec6407409376baa64b is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (299679). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (snyk): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Infinite loop
CWE: CWE-835 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 299679
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-2739

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: bn.js 5.2.3
Patch: 33df26b5771e824f303a79ec6407409376baa64b

Timelineinfo

02/19/2026 CVE reserved
02/20/2026 +1 days Advisory disclosed
02/20/2026 +0 days VulDB entry created
02/22/2026 +2 days VulDB entry last update

Sourcesinfo

Advisory: 186
Status: Confirmed

CVE: CVE-2026-2739 (🔒)
GCVE (CVE): GCVE-0-2026-2739
GCVE (VulDB): GCVE-100-347080

Entryinfo

Created: 02/20/2026 08:05
Updated: 02/22/2026 08:50
Changes: 02/20/2026 08:05 (79), 02/21/2026 06:25 (2), 02/22/2026 08:50 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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