--- /n/sources/plan9/sys/src/cmd/ip/imap4d/imap4d.c	Tue Mar 18 09:50:03 2014
+++ /sys/src/cmd/ip/imap4d/imap4d.c	Tue Sep 22 00:00:00 2026
@@ -33,6 +33,7 @@
 enum
 {
 	UlongMax	= 4294967295,
+	Maxlit		= 64*1024,
 };
 
 struct ParseCmd
@@ -2035,6 +2036,8 @@
 	ulong v;
 
 	v = litlen();
+	if(v > Maxlit)
+		parseErr("literal too long");
 	s = binalloc(&parseBin, v+1, 0);
 	if(s == nil)
 		parseErr("out of memory");