CVE-2026-48934 in Node.js
Summary
by MITRE • 06/26/2026
A flaw in Node.js TLS host verification can cause an attacker to bypass certification validation.
This vulnerability affects all supported release lines: **Node.js 22**, **Node.js 24**, and **Node.js 26**.
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Analysis
by VulDB Data Team • 06/27/2026
This vulnerability represents a critical weakness in Node.js TLS host verification mechanisms that allows attackers to bypass certificate validation during secure communications. The flaw specifically impacts the hostname verification process that occurs when establishing TLS connections, potentially enabling man-in-the-middle attacks where malicious actors can present fraudulent certificates while maintaining the appearance of legitimate secure connections. This issue affects multiple active release lines including Node.js 22, 24, and 26, indicating a widespread impact across the Node.js ecosystem and suggesting that organizations running applications on these versions face significant security risks.
The technical nature of this vulnerability stems from improper handling of hostname validation within the TLS implementation, where the system fails to correctly verify that the certificate presented by a server matches the expected hostname. This weakness can be exploited through various attack vectors including certificate substitution attacks where an attacker presents a valid certificate for a different host than the one the client intended to connect to. The flaw likely resides in the certificate validation logic within Node.js's TLS stack, potentially violating established security protocols that mandate strict hostname verification as part of the certificate chain validation process.
The operational impact of this vulnerability extends beyond simple data interception, as it fundamentally undermines the trust model that secure communications depend upon. Applications using affected Node.js versions may unknowingly establish connections with compromised servers, leading to potential data breaches, credential theft, and unauthorized access to sensitive information. This vulnerability directly impacts organizations relying on Node.js for web services, API integrations, and any application requiring secure TLS connections. The risk is particularly elevated in environments where applications handle sensitive data such as financial transactions, personal identifiable information, or corporate intellectual property.
Organizations should prioritize immediate mitigation by upgrading to patched versions of Node.js 22, 24, and 26, as this represents a critical security vulnerability that can be exploited without user interaction. Additional defensive measures include implementing network-level monitoring to detect anomalous certificate behavior, deploying certificate pinning strategies where appropriate, and conducting comprehensive security assessments of applications using affected Node.js versions. The vulnerability aligns with CWE-295 which specifically addresses improper certificate validation and relates to ATT&CK technique T1046 for network service scanning that could be leveraged to identify vulnerable systems. Organizations should also consider implementing additional layers of security including intrusion detection systems, certificate transparency monitoring, and regular security audits to detect potential exploitation attempts while awaiting official patches.