What's wrong with this entry?
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A new security check prevents path traversal attacks in shell write/create operations. Paths containing .. after a directory segment (which may follow a symlink outside the working directory) are now rejected.
Evidence
Path traversal validator (search for "Path contains '..' traversal") — U19 at line ~212741
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.