CVE-2026-58040 in node
Summary
by MITRE • 07/30/2026
An incomplete fix has been identified in Node.js: HTTPS Agent TLS session reuse skips hostname verification across identity policies (incomplete fix of CVE-2026-48934).
This vulnerability affects Node.js **22.x**, **24.x**, and **26.x**.
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Analysis
by VulDB Data Team • 07/30/2026
The vulnerability described represents a critical security flaw in Node.js HTTPS agent implementation that undermines fundamental transport layer security mechanisms. This issue constitutes an incomplete remediation of a previously identified vulnerability CVE-2026-48934, where the fix failed to properly address hostname verification during TLS session reuse operations. The problem specifically manifests in Node.js versions 22.x, 24.x, and 26.x, affecting organizations that rely on these runtime versions for their applications. The incomplete nature of the fix creates a dangerous security gap where TLS sessions can be reused without proper hostname validation, potentially allowing man-in-the-middle attacks to succeed against applications using affected Node.js versions.
The technical implementation flaw occurs within the HTTPS agent's session management logic where the system skips hostname verification when reusing existing TLS sessions. This behavior violates fundamental security principles of certificate validation and creates opportunities for attackers to exploit the trust relationship between client and server. When a TLS session is established initially, proper hostname verification ensures that the certificate presented by the server matches the expected host name. However, during subsequent session reuse operations, the agent fails to enforce this verification step, allowing connections to proceed even when the certificate chain might have been compromised or when the connection is being redirected to an unauthorized server.
The operational impact of this vulnerability extends beyond simple certificate validation failures and represents a significant threat to application security infrastructure. Applications using Node.js versions 22.x, 24.x, and 26.x may experience unauthorized access attempts, data interception, or service disruption when attackers exploit the session reuse bypass. This vulnerability particularly affects web applications, microservices, and API gateways that rely heavily on HTTPS agent pooling for performance optimization. The risk is compounded by the fact that many applications assume that TLS session reuse provides both performance benefits and security guarantees, creating a false sense of security where the incomplete fix leaves critical attack vectors open.
Organizations should immediately prioritize patching affected Node.js installations to address this vulnerability, as the incomplete fix creates persistent exposure windows for malicious actors. The recommended mitigation strategy involves upgrading to patched versions of Node.js that properly implement hostname verification during TLS session reuse operations. Security teams should also consider implementing additional monitoring and detection measures to identify potential exploitation attempts, particularly focusing on unusual TLS session reuse patterns or certificate validation failures. This vulnerability aligns with CWE-295, which addresses improper certificate validation, and represents a specific implementation gap that could be categorized under ATT&CK technique T1046 for network service scanning or T1573 for encrypted channel establishment.
The broader implications of this vulnerability highlight the importance of comprehensive security testing, particularly for protocol implementations that involve session management and connection reuse. Security practitioners should conduct thorough audits of their Node.js applications to identify potential reliance on vulnerable HTTPS agent behaviors and implement appropriate compensating controls until full patch deployment occurs. The incomplete nature of the previous fix also serves as a reminder of the critical importance of thorough vulnerability remediation processes and the need for comprehensive regression testing when addressing security issues in widely-used runtime environments.