Fix a memory leak

Related: RHEL-120801

fix-memory-leak.patch

@@ -0,0 +1,23 @@
+From b9de95a1caf39c5eee35c984fd0b51ddd1b0d40e Mon Sep 17 00:00:00 2001
+From: Stefan Behnel <stefan_ml@behnel.de>
+Date: Sat, 17 Jan 2026 07:21:23 +0100
+Subject: [PATCH] Add missing "noexcept" to fix a memory leak.
+
+Fixes https://bugs.launchpad.net/lxml/+bug/2138421
+---
+ src/lxml/etree.pyx | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/lxml/etree.pyx b/src/lxml/etree.pyx
+index 2ed3d1e15..3e7dca047 100644
+--- a/src/lxml/etree.pyx
++++ b/src/lxml/etree.pyx
+@@ -668,7 +668,7 @@ cdef class DocInfo:
+         return root_name
+ 
+     @cython.final
+-    cdef tree.xmlDtd* _get_c_dtd(self):
++    cdef tree.xmlDtd* _get_c_dtd(self) noexcept:
+         """"Return the DTD. Create it if it does not yet exist."""
+         cdef xmlDoc* c_doc = self._doc._c_doc
+         cdef xmlNode* c_root_node

python3.14-lxml.spec

@@ -18,6 +18,10 @@ URL:            https://github.com/lxml/lxml
 Source0:        lxml-%{version}-no-isoschematron-rng.tar.gz
 Source1:        get-lxml-source.sh
 
+# Fix a memory leak
+# Resolved upstream: https://github.com/lxml/lxml/commit/459d51e316c319c8f49b3b7d08fb80cbc8585f49
+Patch0:         fix-memory-leak.patch
+
 BuildRequires:  gcc
 BuildRequires:  libxml2-devel
 BuildRequires:  libxslt-devel