diff --git a/infra/base-images/base-runner/test_report b/infra/base-images/base-runner/test_report
index 2f88e1eab..62365dabb 100755
--- a/infra/base-images/base-runner/test_report
+++ b/infra/base-images/base-runner/test_report
@@ -61,8 +61,9 @@ for FUZZER_BINARY in $(find $OUT/ -executable -type f); do
 
   OUT_TXT=$(cat $FUZZER_STDOUT)
   
-  # Strip non-ascii characters.
-  OUT_TXT=${OUT_TXT//[^[:ascii:]]/}
+  # Escape non-printable characters and CDATA end sequence.
+  OUT_TXT=${OUT_TXT//[^[:print:]]/?}
+  OUT_TXT=${OUT_TXT//]]>/?}
 
   REPORT_TEXT=$(cat <<-EOF
 <?xml version="1.0" encoding="UTF-8"?>