1 files changed, 4 insertions, 0 deletions
diff --git a/src/nvim/fileio.c b/src/nvim/fileio.c
index 7573064fa9..1b39a7410a 100644
--- a/src/nvim/fileio.c
+++ b/src/nvim/fileio.c
@@ -1360,6 +1360,10 @@ retry:
               u8c += (unsigned)(*--p) << 16;
               u8c += (unsigned)(*--p) << 24;
             }
+            // Replace characters over INT_MAX with Unicode replacement character
+            if (u8c > INT_MAX) {
+              u8c = 0xfffd;
+            }
           } else {        // UTF-8
             if (*--p < 0x80) {
               u8c = *p;