expat: patch CVE-2026-24515

Pick fix commit from PR linked in NVD report.

(From OE-Core rev: e3c0ac137e50d35e83e8e4ed2c4e09f2eb9d3bca)

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>

2 files changed, 44 insertions, 0 deletions

diff --git a/meta/recipes-core/expat/expat/CVE-2026-24515.patch b/meta/recipes-core/expat/expat/CVE-2026-24515.patch
new file mode 100644
index 0000000000..da11cf81cf
--- /dev/null
+++ b/meta/recipes-core/expat/expat/CVE-2026-24515.patch
@@ -0,0 +1,43 @@
+From 86fc914a7acc49246d5fde0ab6ed97eb8a0f15f9 Mon Sep 17 00:00:00 2001
+From: Sebastian Pipping <sebastian@pipping.org>
+Date: Sun, 18 Jan 2026 17:53:37 +0100
+Subject: [PATCH] lib: Make XML_ExternalEntityParserCreate copy unknown
+ encoding handler user data
+
+Patch suggested by Artiphishell Inc.
+
+CVE: CVE-2026-24515
+Upstream-Status: Backport [https://github.com/libexpat/libexpat/commit/86fc914a7acc49246d5fde0ab6ed97eb8a0f15f9]
+Signed-off-by: Peter Marko <peter.marko@siemens.com>
+---
+ lib/xmlparse.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/lib/xmlparse.c b/lib/xmlparse.c
+index 593cd90d..18577ee3 100644
+--- a/lib/xmlparse.c
++++ b/lib/xmlparse.c
+@@ -1289,6 +1289,7 @@ XML_ExternalEntityParserCreate(XML_Parser oldParser, const XML_Char *context,
+   XML_ExternalEntityRefHandler oldExternalEntityRefHandler;
+   XML_SkippedEntityHandler oldSkippedEntityHandler;
+   XML_UnknownEncodingHandler oldUnknownEncodingHandler;
++  void *oldUnknownEncodingHandlerData;
+   XML_ElementDeclHandler oldElementDeclHandler;
+   XML_AttlistDeclHandler oldAttlistDeclHandler;
+   XML_EntityDeclHandler oldEntityDeclHandler;
+@@ -1333,6 +1334,7 @@ XML_ExternalEntityParserCreate(XML_Parser oldParser, const XML_Char *context,
+   oldExternalEntityRefHandler = parser->m_externalEntityRefHandler;
+   oldSkippedEntityHandler = parser->m_skippedEntityHandler;
+   oldUnknownEncodingHandler = parser->m_unknownEncodingHandler;
++  oldUnknownEncodingHandlerData = parser->m_unknownEncodingHandlerData;
+   oldElementDeclHandler = parser->m_elementDeclHandler;
+   oldAttlistDeclHandler = parser->m_attlistDeclHandler;
+   oldEntityDeclHandler = parser->m_entityDeclHandler;
+@@ -1391,6 +1393,7 @@ XML_ExternalEntityParserCreate(XML_Parser oldParser, const XML_Char *context,
+   parser->m_externalEntityRefHandler = oldExternalEntityRefHandler;
+   parser->m_skippedEntityHandler = oldSkippedEntityHandler;
+   parser->m_unknownEncodingHandler = oldUnknownEncodingHandler;
++  parser->m_unknownEncodingHandlerData = oldUnknownEncodingHandlerData;
+   parser->m_elementDeclHandler = oldElementDeclHandler;
+   parser->m_attlistDeclHandler = oldAttlistDeclHandler;
+   parser->m_entityDeclHandler = oldEntityDeclHandler;
diff --git a/meta/recipes-core/expat/expat_2.5.0.bb b/meta/recipes-core/expat/expat_2.5.0.bb
index 33207ff0da..ae661947c3 100644
--- a/meta/recipes-core/expat/expat_2.5.0.bb
+++ b/meta/recipes-core/expat/expat_2.5.0.bb
@@ -30,6 +30,7 @@ SRC_URI = "https://github.com/libexpat/libexpat/releases/download/R_${VERSION_TA
            file://CVE-2024-45492.patch \
            file://CVE-2024-50602-01.patch \
            file://CVE-2024-50602-02.patch \
+           file://CVE-2026-24515.patch \
            "
 
 UPSTREAM_CHECK_URI = "https://github.com/libexpat/libexpat/releases/"