Bug 2571854 (CVE-2026-123877)

Summary: CVE-2026-123877 nodejs: nodejs: Certificate validation bypass via TLS session cache reuse
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. When managing outbound HTTPS connections, the client connection agent generates identical session-cache keys for requests with differing Certificate Authority (CA) trust configurations. Consequently, an existing Transport Layer Security (TLS) session established under a broad trust policy can be improperly reused by a subsequent request requiring stricter validation. An attacker could exploit this certificate validation bypass to receive confidential data that the application inadvertently transmits to an unauthorized server.
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Description OSIDB Bzimport 2026-11-11 18:41:36 UTC 
A certificate validation bypass in Node.js https.Agent lets a cached TLS session authenticated under one CA policy be reused by a later request with a stricter policy. https.Agent.prototype.getName() assigns the same Agent and session-cache key to a request that omits ca and one that explicitly supplies ca: [], because an omitted value appends nothing to the key while an empty array stringifies to an empty string. The two policies differ: omitting ca uses the default trust store, while supplying ca replaces it. Since they share a key, a TLS session authenticated under the broader default policy is handed to a new connection made under the later ca: [] policy, and TLS 1.3 session resumption carries the earlier authentication forward, so the second request reports authorized === true and transmits confidential data to a server its own CA policy would reject on a fresh connection. This vulnerability affects Node.js 26.x, 24.x, and 22.x.