Sourced fromThe 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 fromcolor-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) vulnerabilitywas responsibly disclosed to me via email by Colin onMar 5 2021 regarding an exponential time complexity forlinearly increasing input lengths forhwb() color strings.
Strings reaching more than 5000 characters would see severalmilliseconds of processing time; strings reaching more than50,000 characters began seeing 1500ms (1.5s) of processing time.
The cause was due to a the regular expression that parseshwb() strings - specifically, the hue value - wherethe integer portion of the hue value used a 0-or-more quantifiershortly thereafter followed by a 1-or-more quantifier.
This caused excessive backtracking and a cartesian scan,resulting in exponential time complexity given a linearincrease in input length.
Thank you Yeting Li and Colin Ife for bringing this to myattention 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 (seehttps://github.com/qix-/color/issues/174).

• See full diff incompare view

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