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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
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Claude Code v2.1.53 ·

Improved File Operation Security

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

File creation and log file operations now use more secure flag combinations:

  • O_EXCL flag added for temp file creation (prevents TOCTOU race conditions)
  • O_NOFOLLOW flag used on supported platforms (prevents symlink-following attacks)
  • Log file open now uses explicit flag combinations (O_WRONLY | O_CREAT | O_APPEND | O_NOFOLLOW) instead of the legacy "a" mode string
Evidence

New file security flags (search for "O_NOFOLLOW")

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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