Node.js up to 25.2.1 denial of service

CVSS Meta Temp Score
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CTI Interest Score
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5.7$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Node.js. Affected by this issue is some unknown functionality. Executing a manipulation can lead to denial of service. This vulnerability is tracked as CVE-2026-21637. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Node.js and classified as problematic. This vulnerability affects an unknown functionality. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

A flaw in Node.js TLS error handling allows remote attackers to crash or exhaust resources of a TLS server when `pskCallback` or `ALPNCallback` are in use. Synchronous exceptions thrown during these callbacks bypass standard TLS error handling paths (tlsClientError and error), causing either immediate process termination or silent file descriptor leaks that eventually lead to denial of service. Because these callbacks process attacker-controlled input during the TLS handshake, a remote client can repeatedly trigger the issue. This vulnerability affects TLS servers using PSK or ALPN callbacks across Node.js versions where these callbacks throw without being safely wrapped.

The advisory is shared for download at nodejs.org. This vulnerability was named CVE-2026-21637 since 01/01/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 296677 (SUSE SLES15 / openSUSE 15 Security Update : nodejs22 (SUSE-SU-2026:0295-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (296677) and CERT Bund (WID-SEC-2026-0098). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Red Hat Enterprise Linux
  • SUSE Linux
  • Oracle Linux
  • RESF Rocky Linux
  • Open Source Node.js

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CNA Base Score: 5.9
CNA Vector (hackerone): 🔒

CVSSv2info

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

Exploitinginfo

Class: Denial of service
CWE: 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: 296677
Nessus Name: SUSE SLES15 / openSUSE 15 Security Update : nodejs22 (SUSE-SU-2026:0295-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

01/01/2026 CVE reserved
01/20/2026 +19 days Advisory disclosed
01/20/2026 +0 days VulDB entry created
02/10/2026 +21 days VulDB entry last update

Sourcesinfo

Advisory: nodejs.org
Status: Confirmed

CVE: CVE-2026-21637 (🔒)
GCVE (CVE): GCVE-0-2026-21637
GCVE (VulDB): GCVE-100-342112
CERT Bund: WID-SEC-2026-0098 - Node.js: Mehrere Schwachstellen

Entryinfo

Created: 01/20/2026 23:55
Updated: 02/10/2026 14:53
Changes: 01/20/2026 23:55 (62), 01/27/2026 16:23 (2), 01/31/2026 05:14 (11), 02/02/2026 08:58 (6), 02/10/2026 14:53 (1)
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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