- Node 17 upgrades to OpenSSL 3.0 (with FIPS) and V8 9.5, tightening algorithm restrictions and introducing possible ERR_OSSL_EVP_UNSUPPORTED errors, a breaking security change.
- Runtime deprecations and defaults changed for dns.lookup (type coercion removed, verbatim=true default) and module resolution (subpath folder mappings EOL, trailing‑slash pattern deprecation) – impacting existing code.