CVE-2019-15604 in Node.js
Summary
by MITRE
Improper Certificate Validation in Node.js 10, 12, and 13 causes the process to abort when sending a crafted X.509 certificate
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Analysis
by VulDB Data Team • 05/08/2026
The vulnerability identified as CVE-2019-15604 represents a critical flaw in Node.js versions 10, 12, and 13 that affects the certificate validation process during secure communications. This issue stems from improper handling of X.509 certificates within the Node.js runtime environment, specifically when the system encounters malformed or crafted certificate structures that trigger an abnormal termination of the application process. The flaw manifests when Node.js attempts to validate certificates that contain unexpected or malformed data structures, causing the runtime to crash rather than gracefully handling the invalid input through proper error mechanisms.
The technical root cause of this vulnerability lies in the certificate validation routines within Node.js's cryptographic libraries where insufficient input sanitization and validation checks allow maliciously crafted certificates to cause memory corruption or stack overflow conditions. When a certificate contains unexpected byte sequences or violates standard X.509 format specifications, the validation process fails to properly handle these edge cases and instead triggers an abrupt process abort. This behavior aligns with CWE-248, an improper exception handling vulnerability that occurs when an application fails to properly handle exceptions or errors, leading to unexpected program termination rather than graceful error recovery. The flaw essentially creates a denial of service condition where legitimate applications can be terminated by sending specially crafted certificates to Node.js processes.
From an operational perspective, this vulnerability poses significant risks to systems running Node.js applications that handle secure communications, particularly those involved in web services, API gateways, or any application that performs certificate validation for SSL/TLS connections. Attackers can exploit this weakness by sending maliciously constructed certificates to Node.js processes, causing them to crash and potentially leading to service disruption or availability issues. The impact extends beyond simple denial of service as this vulnerability can be leveraged in broader attack chains where attackers might use process termination as a stepping stone for more sophisticated exploitation techniques. The vulnerability affects both client and server-side certificate validation scenarios, making it particularly dangerous in environments where Node.js applications act as intermediaries in secure communication flows.
The exploitation of CVE-2019-15604 aligns with several ATT&CK framework techniques including T1059.007 for command and script interpreter and T1499.004 for network disruption, as the vulnerability enables attackers to cause service interruptions through process termination. Organizations running Node.js applications in production environments are particularly vulnerable since this flaw can be triggered through legitimate certificate validation processes without requiring special privileges or complex attack vectors. The vulnerability demonstrates a classic security weakness in cryptographic library implementations where proper error handling and input validation are missing, leading to crash conditions instead of secure error recovery. Mitigation strategies should focus on immediate patching of Node.js installations to versions that address this certificate validation flaw, along with implementing additional monitoring for abnormal process termination events in applications that handle certificate validation. Additionally, organizations should consider implementing certificate pre-validation mechanisms and establishing robust error handling procedures that prevent unhandled exceptions from causing application crashes.