https://bugs.gentoo.org/970987
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/10880
https://gstreamer.freedesktop.org/security/sa-2026-0002.html

From ce0a11b2657bbc434c570ffedd81668d44fd1277 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Thu, 22 Jan 2026 08:13:56 +0200
Subject: [PATCH] qtdemux: Fix out-of-bounds read when parsing PlayReady DRM
 UUIDs

Fixes GST-SA-2026-0002.

Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/4865

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/10880>
--- a/gst/isomp4/qtdemux.c
+++ b/gst/isomp4/qtdemux.c
@@ -3036,7 +3036,7 @@ qtdemux_parse_piff (GstQTDemux * qtdemux, const guint8 * buffer, gint length,
 }
 
 static void
-qtdemux_parse_uuid (GstQTDemux * qtdemux, const guint8 * buffer, gint length)
+qtdemux_parse_uuid (GstQTDemux * qtdemux, const guint8 * buffer, gsize length)
 {
   static const guint8 xmp_uuid[] = { 0xBE, 0x7A, 0xCF, 0xCB,
     0x97, 0xA9, 0x42, 0xE8,
@@ -3080,16 +3080,18 @@ qtdemux_parse_uuid (GstQTDemux * qtdemux, const guint8 * buffer, gint length)
     qtdemux_handle_xmp_taglist (qtdemux, qtdemux->tag_list, taglist);
 
   } else if (memcmp (buffer + offset, playready_uuid, 16) == 0) {
-    int len;
-    const gunichar2 *s_utf16;
-    char *contents;
+    if (length >= offset + 0x30 + 2) {
+      guint16 len = GST_READ_UINT16_LE (buffer + offset + 0x30);
 
-    len = GST_READ_UINT16_LE (buffer + offset + 0x30);
-    s_utf16 = (const gunichar2 *) (buffer + offset + 0x32);
-    contents = g_utf16_to_utf8 (s_utf16, len / 2, NULL, NULL, NULL);
-    GST_ERROR_OBJECT (qtdemux, "contents: %s", contents);
+      if (length >= offset + 0x30 + 2 + len) {
+        const gunichar2 *s_utf16 = (const gunichar2 *) (buffer + offset + 0x32);
+        char *contents = g_utf16_to_utf8 (s_utf16, len / 2, NULL, NULL, NULL);
 
-    g_free (contents);
+        GST_ERROR_OBJECT (qtdemux, "contents: %s", GST_STR_NULL (contents));
+
+        g_free (contents);
+      }
+    }
 
     GST_ELEMENT_ERROR (qtdemux, STREAM, DECRYPT,
         (_("Cannot play stream because it is encrypted with PlayReady DRM.")),
-- 
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