| Description: | regex is an implementation of regular expressions for the Rust
language. The regex crate features built-in mitigations to prevent
denial of service attacks caused by untrusted regexes, or untrusted
input matched by trusted regexes. Those (tunable) mitigations already
provide sane defaults to prevent attacks. This guarantee is documented
and it's considered part of the crate's API. Unfortunately a bug was
discovered in the mitigations designed to prevent untrusted regexes to
take an arbitrary amount of time during parsing, and it's possible to
craft regexes that bypass such mitigations. This makes it possible to
perform denial of service attacks by sending specially crafted regexes
to services accepting user-controlled, untrusted regexes. All versions
of the regex crate before or equal to 1.5.4 are affected by this
issue. The fix is include starting from regex 1.5.5. All users
accepting user-controlled regexes are recommended to upgrade
immediately to the latest version of the regex crate. Unfortunately
there is no fixed set of problematic regexes, as there are practically
infinite regexes that could be crafted to exploit this vulnerability.
Because of this, it us not recommend to deny known problematic
regexes.
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