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Under the Hood of Node.js TLS Vulnerabilities: Inside the June 2026 Security Release

The Node.js Project recently dropped its June 2026 Security Release, patching a cluster of high-severity vulnerabilities across its TLS, network, and DNS subsystems. From case-sensitivity flaws in mTLS matching to C-string null-byte truncation, these bugs allow attackers to slip past strict certificate validation and execute quiet authentication bypasses. Here is an in-depth, structural breakdown of the mechanics behind CVE-2026-48934, CVE-2026-48928, CVE-2026-48930, and CVE-2026-48618—and how to patch your infrastructure immediately.

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