Sourced from The GitHub Security Advisory Database .

Regular Expression Denial of Service (ReDOS) A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in Color-String version 1.5.5 and below which occurs when the application is provided and checks a crafted invalid HWB string.

Affected versions: < 1.5.5

Sourced from color-string's releases .

1.6.0

Minor release 1.6.0

• #55 - Add support for space-separated HSL

Thanks @?htunnicliff for the contribution :)

1.5.5 (Patch/Security Release) - hwb() ReDos patch (low-severity)

Release notes copied verbatim from the commit message, which can be found here: 0789e21284c33d89ebc4ab4ca6f759b9375ac9d3

Discovered by Yeting Li, c/o Colin Ife via Snyk.io.
A ReDos (Regular Expression Denial of Service) vulnerability
was responsibly disclosed to me via email by Colin on
Mar 5 2021 regarding an exponential time complexity for
linearly increasing input lengths for 
hwb()
 color strings.

Strings reaching more than 5000 characters would see several
milliseconds of processing time; strings reaching more than
50,000 characters began seeing 1500ms (1.5s) of processing time.

The cause was due to a the regular expression that parses
hwb() strings - specifically, the hue value - where
the integer portion of the hue value used a 0-or-more quantifier
shortly thereafter followed by a 1-or-more quantifier.

This caused excessive backtracking and a cartesian scan,
resulting in exponential time complexity given a linear
increase in input length.

Thank you Yeting Li and Colin Ife for bringing this to my
attention in a secure, responsible and professional manner.

A CVE will not be assigned for this vulnerability.

1.5.4 (Patch Release)

• Removes rounding of alpha values in RGBA hex ( #rrggbbaa ) and condensed-hex ( #rgba ) parsers, which caused certain unique inputs to result in identical outputs (see https://github.com/qix-/color/issues/174 ).

• See full diff in compare view

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