diff -Nru jasper-4.2.1/CMakeLists.txt jasper-4.2.3/CMakeLists.txt
--- jasper-4.2.1/CMakeLists.txt	2024-02-18 09:37:59.000000000 +0000
+++ jasper-4.2.3/CMakeLists.txt	2024-03-30 16:57:05.000000000 +0000
@@ -12,7 +12,7 @@
 # The major, minor, and micro version numbers of the project.
 set(JAS_VERSION_MAJOR 4)
 set(JAS_VERSION_MINOR 2)
-set(JAS_VERSION_PATCH 1)
+set(JAS_VERSION_PATCH 3)
 
 # The shared library versioning information.
 # Guidelines on how to change this information can be found below.
@@ -822,10 +822,10 @@
 	# We only want to include directories in the installed rpath if they
 	# will not be considered implicitly.
 	list(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES
-	  "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}" jas_is_system_dir)
+	  "${CMAKE_INSTALL_FULL_LIBDIR}" jas_is_system_dir)
 	if(jas_is_system_dir EQUAL -1)
 	   set(CMAKE_INSTALL_RPATH
-		  "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}")
+		  "${CMAKE_INSTALL_FULL_LIBDIR}")
 	endif()
 
 endif()
diff -Nru jasper-4.2.1/NEWS.txt jasper-4.2.3/NEWS.txt
--- jasper-4.2.1/NEWS.txt	2024-02-18 09:37:59.000000000 +0000
+++ jasper-4.2.3/NEWS.txt	2024-03-30 16:57:05.000000000 +0000
@@ -1,3 +1,13 @@
+4.2.3 (2024-03-30)
+==================
+
+* Added a missing check in the JPC codec (#381).
+
+4.2.2 (2024-03-11)
+==================
+
+* Fix minor build issue (#374).
+
 4.2.1 (2024-02-18)
 ==================
 
Binary files /tmp/tmpap9tgcib/OqfzLyVjup/jasper-4.2.1/data/test/bad/318.jpc and /tmp/tmpap9tgcib/neTvrJLwER/jasper-4.2.3/data/test/bad/318.jpc differ
diff -Nru jasper-4.2.1/debian/changelog jasper-4.2.3/debian/changelog
--- jasper-4.2.1/debian/changelog	2024-03-04 20:30:28.000000000 +0000
+++ jasper-4.2.3/debian/changelog	2024-04-20 18:57:06.000000000 +0000
@@ -1,3 +1,9 @@
+jasper (4.2.3-0ubuntu1~20.04.sav0) focal; urgency=medium
+
+  * New upstream release
+
+ -- Rob Savoury <savoury@savos.tech>  Sat, 20 Apr 2024 11:57:06 -0700
+
 jasper (4.2.1-0ubuntu1~20.04.sav0) focal; urgency=medium
 
   * New upstream release
diff -Nru jasper-4.2.1/src/libjasper/jpc/jpc_dec.c jasper-4.2.3/src/libjasper/jpc/jpc_dec.c
--- jasper-4.2.1/src/libjasper/jpc/jpc_dec.c	2024-02-18 09:37:59.000000000 +0000
+++ jasper-4.2.3/src/libjasper/jpc/jpc_dec.c	2024-03-30 16:57:05.000000000 +0000
@@ -611,7 +611,9 @@
 	if (dec->pkthdrstreams) {
 		/* Get the stream containing the packet header data for this
 		  tile-part. */
-		if (!(tile->pkthdrstream = jpc_streamlist_remove(dec->pkthdrstreams, 0))) {
+		if (jpc_streamlist_numstreams(dec->pkthdrstreams) != 0 &&
+		  !(tile->pkthdrstream = jpc_streamlist_remove(dec->pkthdrstreams,
+		  0))) {
 			return -1;
 		}
 	}