VULNERABILITY ------------- curl doesn't parse the authority component of the URL correctly when the host name part ends with a '#' character, and could instead be tricked into connecting to a different host. This may have security implications if you for example use an URL parser that follows the RFC to check for allowed domains before using curl to request them. Passing in `http://example.com#@evil.com/x.txt` would wrongly make curl send a request to evil.com while your browser would connect to example.com given the same URL. The problem exists for most protocol schemes. We are not aware of any exploit of this flaw. INFO ---- The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2016-XXXX to this issue. AFFECTED VERSIONS ----------------- This flaw exists in the following curl versions. - Affected versions: curl 7.1 to and including 7.50.3 - Not affected versions: curl >= 7.51.0 libcurl is used by many applications, but not always advertised as such! THE SOLUTION ------------ In version 7.51.0, the parser function is fixed. A [patch for CVE-2016-XXXX](https://curl.haxx.se/s3c/J.patch) is available. RECOMMENDATIONS --------------- We suggest you take one of the following actions immediately, in order of preference: A - Upgrade curl and libcurl to version 7.51.0 B - Apply the patch to your version and rebuild C - Strip out the parts of the URLs containing '#' before passing them to curl
