libcurl can be told to save cookie, HSTS and/or alt-svc data to files. When
doing this, it called `stat()` followed by `fopen()` in a way that made it
vulnerable to a TOCTOU race condition problem.

By exploiting this flaw, an attacker could trick the victim to create or
overwrite protected files holding this data in ways it was not intended to.

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Kaynak: National Vulnerability Database