diff --git a/news/9827.bugfix.rst b/news/9827.bugfix.rst
new file mode 100644
index 00000000000..e0d27c36cfe
--- /dev/null
+++ b/news/9827.bugfix.rst
@@ -0,0 +1,3 @@
+**SECURITY**: Stop splitting on unicode separators in git references,
+which could be maliciously used to install a different revision on the
+repository.