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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.53 ·

Bash Command Security Checks: Unicode Whitespace and Mid-Word Hash

Entry
JSON All of v2.1.53
EntryKind: in v2.1.53,
ChangesSection of the release
What

Two new security checks detect potentially dangerous command patterns before execution.

Details
  • Unicode whitespace detection: Commands containing exotic Unicode whitespace characters (such as non-breaking spaces \u00A0, em spaces \u2000-\u200A, and others) are now flagged, as these can cause parsing inconsistencies between shell-quote and bash
  • Mid-word hash detection: Commands containing # characters mid-word (e.g., not preceded by whitespace) are flagged because shell-quote and bash parse these differently — bash treats # as a comment start in some contexts while shell-quote does not
  • Both checks trigger a user confirmation prompt ("ask" behavior) rather than blocking outright
Evidence

New security check IDs UNICODE_WHITESPACE and MID_WORD_HASH (search for "UNICODE_WHITESPACE" and "MID_WORD_HASH")

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

See this entry in the whole of v2.1.53 →

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