buffer: recreate pooled ArrayBuffer after transfer #61364

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lindsaycode05 wants to merge 1 commit into nodejs:main

from lindsaycode05:fix/buffer-transfer-pooled-ab

Open

buffer: recreate pooled ArrayBuffer after transfer #61364

lindsaycode05 wants to merge 1 commit into nodejs:main from lindsaycode05:fix/buffer-transfer-pooled-ab

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@lindsaycode05 lindsaycode05 commented Jan 13, 2026

Fixes #61362

Summary

After a Buffer backed by the internal pool has its ArrayBuffer detached (e.g. via ArrayBuffer.prototype.transfer()), subsequent Buffer.from(..., 'base64') calls would throw ERR_BUFFER_OUT_OF_BOUNDS. This change ensures pooled Buffer creation doesn’t rely on a detached pool ArrayBuffer.

Repro

const base64 = Buffer.from('hello', 'utf8').toString('base64');
const first = Buffer.from(base64, 'base64');
first.buffer.transfer();
Buffer.from(base64, 'base64'); // threw `ERR_BUFFER_OUT_OF_BOUNDS` before, succeeds now