| Package | Affected versions | Patched versions |
|---|---|---|
| curl | = 7.27.0= 7.28.0= 7.28.1= 7.29.0= 7.30.0= 7.31.0= 7.32.0= 7.33.0= 7.34.0= 7.35.0 | |
| libcurl | = 7.27.0= 7.28.0= 7.28.1= 7.29.0= 7.30.0= 7.31.0= 7.32.0= 7.33.0= 7.34.0= 7.35.0= 7.36.0 |
curl and libcurl 7.27.0 through 7.35.0, when running on Windows and using the SChannel/Winssl TLS backend, does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate when accessing a URL that uses a numerical IP address, which allows man-in-the-middle attackers to spoof servers via an arbitrary valid certificate.
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