http2: validate initialWindowSize per HTTP/2 spec #61402
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The HTTP/2 spec (RFC 7540) defines SETTINGS_INITIAL_WINDOW_SIZE maximum as 2^31-1. Values above this must be treated as a FLOW_CONTROL_ERROR. Previously, Node.js allowed values up to 2^32-1 which caused nghttp2_submit_settings() to return NGHTTP2_ERR_INVALID_ARGUMENT, triggering an uncatchable assertion failure and crashing the process. This change adds proper validation to reject values >= 2^31 with a catchable RangeError before they reach nghttp2.
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RafaelGSS
approved these changes
Jan 16, 2026
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #61402 +/- ##
=======================================
Coverage 88.54% 88.54%
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Files 704 704
Lines 208806 208807 +1
Branches 40316 40323 +7
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+ Hits 184878 184887 +9
+ Misses 15914 15910 -4
+ Partials 8014 8010 -4
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lpinca
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Jan 16, 2026
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The HTTP/2 spec (RFC 7540) defines SETTINGS_INITIAL_WINDOW_SIZE maximum as 2^31-1. Values above this must be treated as a FLOW_CONTROL_ERROR. Previously, Node.js allowed values up to 2^32-1 which caused nghttp2_submit_settings() to return NGHTTP2_ERR_INVALID_ARGUMENT, triggering an uncatchable assertion failure and crashing the process.
This change adds proper validation to reject values >= 2^31 with a catchable RangeError before they reach nghttp2.