Bug 2571841 (CVE-2026-123871)

Summary: CVE-2026-123871 nodejs: Node.js: Information disclosure via invalid proxy configuration error messages
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Node.js. This vulnerability allows information disclosure when invalid proxy configurations trigger error handling routines that fail to redact authentication details. Under these conditions, the application outputs raw proxy URLs containing embedded usernames and passwords to error streams and log services. An unauthorized actor with access to system logs, monitoring outputs, or crash reports can retrieve these credentials to access restricted proxy resources.
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Description OSIDB Bzimport 2026-11-11 18:31:55 UTC 
Node.js discloses proxy credentials in ERR_PROXY_INVALID_CONFIG error messages. CVE-2026-48615 established that a proxy credential must not appear in a Node.js error message and redacted the username and password from ProxyConfig.href, but that fix missed four error paths in the same subsystem, one of them inside the same constructor, which interpolate the raw proxy URL, credentials included, into an ERR_PROXY_INVALID_CONFIG message. The proxy URL comes from the environment, but the defect is the sink: a secret that Node.js redacts everywhere else is emitted verbatim into a much wider audience than the process environment, such as stderr, container logs, log aggregation, and crash reporting services. This vulnerability affects Node.js 26.x, 24.x, and 22.x.