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-rw-r--r--variable.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/variable.c b/variable.c
index e3da3615f0..177f61c76d 100644
--- a/variable.c
+++ b/variable.c
@@ -1337,6 +1337,8 @@ rb_cvar_set(klass, id, val)
{
VALUE tmp;
+ if (!OBJ_TAINTED(klass) && rb_safe_level() >= 4)
+ rb_raise(rb_eSecurityError, "Insecure: can't modify class variable");
if (FL_TEST(klass, FL_SINGLETON)) {
klass = rb_iv_get(klass, "__attached__");
}