# HG changeset patch
# User Sebastien Jodogne <s.jodogne@gmail.com>
# Date 1792679127 -7200
# Node ID 5bfcb432ad3d46037323ed48b48bd140ae2c472c
# Parent  fe50e37b83eab5a9cf1ee4484abdc3b3d5f26b12
setting DCMTK_MAX_SEQUENCE_NESTING to 32

diff -r fe50e37b83ea -r 5bfcb432ad3d NEWS
--- a/NEWS	Thu Oct 22 15:32:11 2026 +0200
+++ b/NEWS	Thu Oct 22 16:25:27 2026 +0200
@@ -48,6 +48,7 @@
 * New CMake options: 
   - "THIRD_PARTY_DOWNLOADS_ROOT_URL" to specify another webserver to downloads the third-parties from.
   - "ORTHANC_SOURCES_DOWNLOADS_ROOT_URL" to specify another webserver to downloads the Orthanc sources from.
+* Setting DCMTK_MAX_SEQUENCE_NESTING to 32
 * Upgraded dependencies for static builds:
   - dcmtk 3.7.1
   - openssl 3.5.9 (LTS branch)
diff -r fe50e37b83ea -r 5bfcb432ad3d OrthancFramework/Resources/CMake/DcmtkConfigurationStatic-3.7.1.cmake
--- a/OrthancFramework/Resources/CMake/DcmtkConfigurationStatic-3.7.1.cmake	Thu Oct 22 15:32:11 2026 +0200
+++ b/OrthancFramework/Resources/CMake/DcmtkConfigurationStatic-3.7.1.cmake	Thu Oct 22 16:25:27 2026 +0200
@@ -318,3 +318,17 @@
 if (DCMTK_LOCALE_BACKEND STREQUAL "oficonv")
   AUX_SOURCE_DIRECTORY(${DCMTK_SOURCES_DIR}/oficonv/libsrc DCMTK_SOURCES)
 endif()
+
+
+# 2026-10-22: On several GNU/Linux distributions (notably Ubuntu
+# 22.04), Orthanc was observed to crash when using the system-wide
+# civetweb library and allowing DCMTK to process sequences nested up
+# to 37 levels deep. This issue can be reproduced using the DICOM
+# sample file
+# "orthanc-tests/Database/2026-05-06-Deeply-Nested-Sequence.dcm". The
+# issue does not occur when civetweb is statically linked by setting
+# "-DUSE_SYSTEM_CIVETWEB=OFF". The exact cause for this difference is
+# unknown, but it appears to be related to stack management across
+# shared libraries. We therefore limit the maximum nesting depth to 32
+# levels.
+add_definitions(-DDCMTK_MAX_SEQUENCE_NESTING=32)