From 6c5d90bdcec0949f7ba06db62fb740dab394b582 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@ruby-lang.org>
Date: Wed, 21 Feb 2024 11:05:06 -0800
Subject: [PATCH] Fixing ReDoS in header parsing

Thanks svalkanov

[CVE-2024-26146]
---
 lib/rack/utils.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/rack/utils.rb b/lib/rack/utils.rb
index 16457f90c..4ec030b8f 100644
--- a/lib/rack/utils.rb
+++ b/lib/rack/utils.rb
@@ -146,8 +146,8 @@ def build_nested_query(value, prefix = nil)
     module_function :build_nested_query
 
     def q_values(q_value_header)
-      q_value_header.to_s.split(/\s*,\s*/).map do |part|
-        value, parameters = part.split(/\s*;\s*/, 2)
+      q_value_header.to_s.split(',').map do |part|
+        value, parameters = part.split(';', 2).map(&:strip)
         quality = 1.0
         if parameters && (md = /\Aq=([\d.]+)/.match(parameters))
           quality = md[1].to_f