diff -up ncurses-6.2-20210508/configure.setuid ncurses-6.2-20210508/configure
--- ncurses-6.2-20210508/configure.setuid	2021-05-02 02:35:51.000000000 +0200
+++ ncurses-6.2-20210508/configure	2023-08-21 14:22:48.925376959 +0200
@@ -784,6 +784,7 @@ Fine-Tuning Your Configuration:
   --enable-getcap-cache   cache translated termcaps in ~/.terminfo
   --disable-home-terminfo drop ~/.terminfo from terminfo search-path
   --disable-root-environ  restrict environment when running as root
+  --disable-setuid-environ restrict setuid use of ncurses environment variables
   --enable-symlinks       make tic use symbolic links not hard links
   --enable-broken_linker  compile with broken-linker support code
   --enable-bsdpad         recognize BSD-style prefix padding
@@ -9224,6 +9225,20 @@ cat >>confdefs.h <<\EOF
 #define USE_ROOT_ENVIRON 1
 EOF
 
+# Check whether --enable-setuid-environ or --disable-setuid-environ was given.
+if test "${enable_setuid_environ+set}" = set; then
+  enableval="$enable_setuid_environ"
+  with_setuid_environ=$enableval
+else
+  with_setuid_environ=$with_root_environ
+fi;
+echo "$as_me:9942: result: $with_setuid_environ" >&5
+echo "${ECHO_T}$with_setuid_environ" >&6
+test "x$with_setuid_environ" = xyes &&
+cat >>confdefs.h <<\EOF
+#define USE_SETUID_ENVIRON 1
+EOF
+
 ###   Use option --enable-symlinks to make tic use symlinks, not hard links
 ###   to reduce storage requirements for the terminfo database.
 
diff -up ncurses-6.2-20210508/ncurses/curses.priv.h.setuid ncurses-6.2-20210508/ncurses/curses.priv.h
--- ncurses-6.2-20210508/ncurses/curses.priv.h.setuid	2021-04-04 00:12:56.000000000 +0200
+++ ncurses-6.2-20210508/ncurses/curses.priv.h	2023-08-21 14:22:48.925376959 +0200
@@ -210,7 +210,7 @@ extern int errno;
  * If desired, one can configure this, disabling environment variables that
  * point to custom terminfo/termcap locations.
  */
-#ifdef USE_ROOT_ENVIRON
+#if defined(USE_ROOT_ENVIRON) && defined(USE_SETUID_ENVIRON)
 #define use_terminfo_vars() 1
 #else
 #define use_terminfo_vars() _nc_env_access()
diff -up ncurses-6.2-20210508/ncurses/tinfo/access.c.setuid ncurses-6.2-20210508/ncurses/tinfo/access.c
--- ncurses-6.2-20210508/ncurses/tinfo/access.c.setuid	2020-08-29 18:22:03.000000000 +0200
+++ ncurses-6.2-20210508/ncurses/tinfo/access.c	2023-08-21 14:22:48.925376959 +0200
@@ -37,6 +37,8 @@
 
 #include <tic.h>
 
+#include <sys/auxv.h>
+
 MODULE_ID("$Id: access.c,v 1.27 2020/08/29 16:22:03 juergen Exp $")
 
 #define LOWERCASE(c) ((isalpha(UChar(c)) && isupper(UChar(c))) ? tolower(UChar(c)) : (c))
@@ -169,7 +171,18 @@ _nc_is_file_path(const char *path)
     return result;
 }
 
-#ifndef USE_ROOT_ENVIRON
+#define is_posix_elevated() \
+	(getuid() != geteuid() \
+	 || getgid() != getegid())
+
+#define is_elevated() \
+	(getauxval(AT_SECURE) \
+	 ? TRUE \
+	 : (errno != ENOENT \
+	    ? FALSE \
+	    : is_posix_elevated()))
+
+#if !defined(USE_ROOT_ENVIRON) || !defined(USE_SETUID_ENVIRON)
 /*
  * Returns true if we allow application to use environment variables that are
  * used for searching lists of directories, etc.
@@ -177,15 +190,18 @@ _nc_is_file_path(const char *path)
 NCURSES_EXPORT(int)
 _nc_env_access(void)
 {
-#if HAVE_ISSETUGID
-    if (issetugid())
-	return FALSE;
-#elif HAVE_GETEUID && HAVE_GETEGID
-    if (getuid() != geteuid()
-	|| getgid() != getegid())
-	return FALSE;
+    int result = TRUE;
+
+#if !defined(USE_SETUID_ENVIRON)
+    if (is_elevated()) {
+	result = FALSE;
+    }
 #endif
-    /* ...finally, disallow root */
-    return (getuid() != ROOT_UID) && (geteuid() != ROOT_UID);
+#if !defined(USE_ROOT_ENVIRON)
+    if ((getuid() == ROOT_UID) || (geteuid() == ROOT_UID)) {
+	result = FALSE;
+    }
+#endif
+    return result;
 }
 #endif
diff -up ncurses-6.2-20210508/ncurses/tinfo/comp_error.c.setuid ncurses-6.2-20210508/ncurses/tinfo/comp_error.c
--- ncurses-6.2-20210508/ncurses/tinfo/comp_error.c.setuid	2023-08-21 14:27:08.268309417 +0200
+++ ncurses-6.2-20210508/ncurses/tinfo/comp_error.c	2023-08-21 14:33:13.716214256 +0200
@@ -148,8 +148,8 @@ _nc_syserr_abort(const char *const fmt,
     /* If we're debugging, try to show where the problem occurred - this
      * will dump core.
      */
-#ifndef USE_ROOT_ENVIRON
-    if (getuid() != ROOT_UID)
+#if !defined(USE_ROOT_ENVIRON) || !defined(USE_SETUID_ENVIRON)
+    if (_nc_env_access())
 #endif
 	abort();
 #endif
diff -up ncurses-6.2-20210508/ncurses/tinfo/write_entry.c.setuid ncurses-6.2-20210508/ncurses/tinfo/write_entry.c
--- ncurses-6.2-20210508/ncurses/tinfo/write_entry.c.setuid	2020-08-29 18:22:03.000000000 +0200
+++ ncurses-6.2-20210508/ncurses/tinfo/write_entry.c	2023-08-21 14:32:22.738227530 +0200
@@ -215,11 +215,7 @@ _nc_set_writedir(const char *dir)
     const char *destination;
     char actual[PATH_MAX];
 
-    if (dir == 0
-#ifndef USE_ROOT_ENVIRON
-	&& use_terminfo_vars()
-#endif
-	)
+    if (dir == 0 && use_terminfo_vars())
 	dir = getenv("TERMINFO");
 
     if (dir != 0)