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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.234 ·

String sanitizer builds prototype-free objects

A key named __proto__ in input can no longer tamper with the sanitized result.

Under the hood Internal Changes
JSON All of v2.1.234
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
Internal ChangesKind: in v2.1.234,
Internal ChangesSection of the release
What

The recursive sanitizer now creates its result with Object.create(null) and takes the per-string transform as an argument, so an input key like __proto__ cannot alter the object it produces.

Evidence

Object.create(null)

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.234 →

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