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Regexp.union [] gives wrong result in ruby 1.8 mode #2295

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jeremyevans opened this Issue Dec 9, 2014 · 1 comment

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jeremyevans commented Dec 9, 2014

With jruby 1.7.17 (and going back at least to 1.7.6 and probably longer), Regexp.union [] in ruby 1.8 mode gives // instead of /(?!)/. In ruby 1.9 mode, it gives /(?!)/. MRI 1.8.7 behavior is /(?!)/. So instead of the regexp matching nothing, this bug makes the regexp match everything.

While not a security vulnerability itself, this can potentially cause security vulnerabilities, if the result of the Regexp.union [] call is being used as a whitelist filter.

@enebo enebo added this to the JRuby 1.7.18 milestone Dec 9, 2014

@rtyler rtyler added the JRuby 1.7.x label Dec 9, 2014

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enebo commented Dec 10, 2014

Err Fixed in commit 62761f7.

@enebo enebo closed this Dec 10, 2014

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