Blame SOURCES/0001-patch-8.1.1365-source-command-doesn-t-check-for-the-.patch

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diff -up vim80/src/getchar.c.cve vim80/src/getchar.c
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--- vim80/src/getchar.c.cve	2019-06-14 13:46:17.269523985 +0200
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+++ vim80/src/getchar.c	2019-06-14 13:46:58.427169288 +0200
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@@ -1418,6 +1418,12 @@ openscript(
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 	EMSG(_(e_nesting));
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 	return;
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     }
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+
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+    // Disallow sourcing a file in the sandbox, the commands would be executed
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+    // later, possibly outside of the sandbox.
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+    if (check_secure())
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+	return;
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+
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 #ifdef FEAT_EVAL
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     if (ignore_script)
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 	/* Not reading from script, also don't open one.  Warning message? */