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XMLHttpRequest corrupts headers named after Object prototype properties #58232
Description
Description
React Native XMLHttpRequest stores request headers and normalized response headers in ordinary objects. Valid header names that collide with Object.prototype are therefore corrupted or hidden: repeated Constructor values begin with inherited function text, __proto__ cannot be stored normally, and an absent toString response header is returned as an inherited function instead of null.
Expected behavior
All valid case-insensitive header names should be stored, combined, and retrieved as their own values without interacting with JavaScript object prototypes.
React Native Version
0.87.1 and current main
Affected Platforms
JavaScript networking - All
Activity
react-native-bot commentedon Aug 30, 2026
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react-native-bot commentedon Sep 24, 2026
This issue is waiting for author's feedback since 24 days. Please provide the requested feedback or this will be closed in 7 days.
react-native-bot commentedon Oct 1, 2026
This issue was closed because it has been stalled for 7 days with no activity.
react-native-bot commentedon Oct 1, 2026
This issue was closed because the author hasn't provided the requested feedback after 7 days.