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Fix regression with header removal removing whole prefixes #21020

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Fix regression with header removal removing whole prefixes #21020

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f2ab035
Fix regression with header removing removing whole prefixes
NattyNarwhal Jan 23, 2026
b31a03f
avoid reading past the actual length
NattyNarwhal Jan 23, 2026
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21 changes: 21 additions & 0 deletions ext/standard/tests/general_functions/gh21018.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,21 @@
--TEST--
GH-21018 (header() removes headers with the same prefix)
--INI--
expose_php=On
--CGI--
--FILE--
<?php
header('a: 1');
header('a-test: 1');
header('a: 1');
var_dump(headers_list());
?>
--EXPECTF--
array(3) {
[0]=>
string(%d) "X-Powered-By: PHP/%s"
[1]=>
string(9) "a-test: 1"
[2]=>
string(4) "a: 1"
}
8 changes: 6 additions & 2 deletions main/SAPI.c
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Original file line number Diff line number Diff line change
Expand Up @@ -610,8 +610,12 @@ static void sapi_remove_header(zend_llist *l, char *name, size_t len, size_t hea
while (current) {
header = (sapi_header_struct *)(current->data);
next = current->next;
if (header->header_len > header_len
&& (header->header[header_len] == ':' || len > header_len)
/*
* header_len is set for DELETE_PREFIX (used in cookies)
* look for the : otherwise
*/
if (header->header_len > len
&& (header->header[len] == ':' || (header_len && len > header_len))
&& !strncasecmp(header->header, name, len)) {
if (current->prev) {
current->prev->next = next;
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