[Resolver] Ensure that spec.required_ruby_version exists before using it

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/bundler/resolver.rb b/lib/bundler/resolver.rb
index 50a391e592..9d947cc9f9 100644
--- a/lib/bundler/resolver.rb
+++ b/lib/bundler/resolver.rb
@@ -125,7 +125,13 @@ module Bundler
       def for?(platform, ruby_version)
         spec = @specs[platform]
         return false unless spec
-        return true if ruby_version.nil? || !spec.is_a?(EndpointSpecification)
+
+        return true if ruby_version.nil?
+        # Only allow endpoint specifications since they won't hit the network to
+        # fetch the full gemspec when calling required_ruby_version
+        return true if !spec.is_a?(EndpointSpecification) && !spec.is_a?(Gem::Specification)
+        return true if spec.required_ruby_version.nil?
+
         spec.required_ruby_version.satisfied_by?(ruby_version.to_gem_version_with_patchlevel)
       end