https://github.com/curl/curl/commit/9919149aef67014150e2a1c75a7aa2c79204e30d
From: Daniel Stenberg <daniel@haxx.se>
Date: Wed, 6 Nov 2024 11:26:25 +0100
Subject: [PATCH] cookie: treat cookie name case sensitively

Extend test 31 to verify

Reported-by: delogicsreal on github
Fixes #15492
Closes #15493
--- a/lib/cookie.c
+++ b/lib/cookie.c
@@ -989,7 +989,7 @@ replace_existing(struct Curl_easy *data,
   size_t myhash = cookiehash(co->domain);
   for(n = Curl_llist_head(&ci->cookielist[myhash]); n; n = Curl_node_next(n)) {
     struct Cookie *clist = Curl_node_elem(n);
-    if(strcasecompare(clist->name, co->name)) {
+    if(!strcmp(clist->name, co->name)) {
       /* the names are identical */
       bool matching_domains = FALSE;
 
@@ -1029,7 +1029,7 @@ replace_existing(struct Curl_easy *data,
       }
     }
 
-    if(!replace_n && strcasecompare(clist->name, co->name)) {
+    if(!replace_n && !strcmp(clist->name, co->name)) {
       /* the names are identical */
 
       if(clist->domain && co->domain) {
--- a/tests/data/test31
+++ b/tests/data/test31
@@ -26,6 +26,7 @@ Set-Cookie: blankdomain=sure; domain=; path=/
 %if !hyper
 Set-Cookie: foobar=name; domain=anything.com; path=/ ; secure
 Set-Cookie:ismatch=this  ; domain=test31.curl; path=/silly/
+Set-Cookie:ISMATCH=this  ; domain=test31.curl; path=/silly/
 Set-Cookie: overwrite=this  ; domain=test31.curl; path=/overwrite/
 Set-Cookie: overwrite=this2  ; domain=test31.curl; path=/overwrite
 Set-Cookie: sec1value=secure1  ; domain=test31.curl; path=/secure1/ ; secure
@@ -75,6 +76,7 @@ Set-Cookie: securewithspace=after    ; secure =
 %else
 Set-Cookie: foobar=name; domain=anything.com; path=/ ; secure
 Set-Cookie: ismatch=this  ; domain=test31.curl; path=/silly/
+Set-Cookie:ISMATCH=this  ; domain=test31.curl; path=/silly/
 Set-Cookie: overwrite=this  ; domain=test31.curl; path=/overwrite/
 Set-Cookie: overwrite=this2  ; domain=test31.curl; path=/overwrite
 Set-Cookie: sec1value=secure1  ; domain=test31.curl; path=/secure1/ ; secure
@@ -181,6 +183,7 @@ test31.curl	FALSE	/we/want/	FALSE	2118138987	nodomain	value
 #HttpOnly_.test31.curl	TRUE	/p2/	FALSE	0	httpo2	value2
 #HttpOnly_.test31.curl	TRUE	/p1/	FALSE	0	httpo1	value1
 .test31.curl	TRUE	/overwrite	FALSE	0	overwrite	this2
+.test31.curl	TRUE	/silly/	FALSE	0	ISMATCH	this
 .test31.curl	TRUE	/silly/	FALSE	0	ismatch	this
 test31.curl	FALSE	/	FALSE	0	blankdomain	sure
 </file>