From a47a5ce2d6fa2ac79c348f851d04fa1650b4db72 Mon Sep 17 00:00:00 2001
From: Thiruvalluvan M G <thiru@afer.com>
Date: Tue, 2 Apr 2024 18:40:58 +0530
Subject: [PATCH] Fixed a bug that allowed prhibited unicode values

---
 lang/c++/impl/json/JsonIO.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lang/c++/impl/json/JsonIO.cc b/lang/c++/impl/json/JsonIO.cc
index 9ea4be66c3f..d30d1fded49 100644
--- a/lang/c++/impl/json/JsonIO.cc
+++ b/lang/c++/impl/json/JsonIO.cc
@@ -403,6 +403,10 @@ string JsonParser::decodeString(const string &s, bool binary) {
                                             % string(startSeq, it));
                         }
                         n = 0x10000 + (((n - 0xd800) << 10) | (m - 0xdc00));
+                    } else if (n >= 0xdc00 && n < 0xdfff) {
+                        throw Exception(boost::format(
+                                            "Invalid unicode sequence: %1%")
+                                        % string(startSeq, it));
                     }
                     if (n < 0x80) {
                         result.push_back(n);