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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

← All of v2.1.53 Home All releases ←olderv2.1.52 v2.1.54newer→
Claude Code v2.1.53

Improved File Operation Security

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.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.53 →