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CVE-2026-42448 — wormhole receive, with --output pointing at an existing directory can be path-traversed

2026-10-09T16:36:04.978089+00:00

Affected: magic-wormhole

Magic Wormhole makes it possible to get arbitrary-sized files and directories from one computer to another. Prior to 0.24.0, there is a path traversal when a receiver who specifies "--output

" where that output directory currently exists (as a directory). This vulnerability is fixed in 0.24.0.

GHSA-cf92-gfcw-6v53 — Magic Wormhole: receive, with --output pointing at an existing directory can be path-traversed

2026-10-09T16:36:04.978217+00:00

Affected: PyPI: magic-wormhole

### Impact A receiver who specifies "--output

" where that output directory currently exists (as a directory).

### Patches 0.24.0 will contain the patch

### Workarounds Ensure local target directories specified by "--output" do not already exist

### Resources Private email and Signal communications from a user. Magic Wormhole thanks @marduc812