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[Fix] parse: ignore __proto__ keys (#428)
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ljharb committed Dec 28, 2021
1 parent 691e739 commit ed0f5dc
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Showing 2 changed files with 61 additions and 1 deletion.
2 changes: 1 addition & 1 deletion lib/parse.js
Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,7 @@ var parseObject = function (chain, val, options) {
) {
obj = [];
obj[index] = leaf;
} else {
} else if (cleanRoot !== '__proto__') {
obj[cleanRoot] = leaf;
}
}
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60 changes: 60 additions & 0 deletions test/parse.js
Original file line number Diff line number Diff line change
Expand Up @@ -530,6 +530,66 @@ test('parse()', function (t) {
st.end();
});

t.test('dunder proto is ignored', function (st) {
var payload = 'categories[__proto__]=login&categories[__proto__]&categories[length]=42';
var result = qs.parse(payload, { allowPrototypes: true });

st.deepEqual(
result,
{
categories: {
length: '42'
}
},
'silent [[Prototype]] payload'
);

var plainResult = qs.parse(payload, { allowPrototypes: true, plainObjects: true });

st.deepEqual(
plainResult,
{
__proto__: null,
categories: {
__proto__: null,
length: '42'
}
},
'silent [[Prototype]] payload: plain objects'
);

var query = qs.parse('categories[__proto__]=cats&categories[__proto__]=dogs&categories[some][json]=toInject', { allowPrototypes: true });

st.notOk(Array.isArray(query.categories), 'is not an array');
st.notOk(query.categories instanceof Array, 'is not instanceof an array');
st.deepEqual(query.categories, { some: { json: 'toInject' } });
st.equal(JSON.stringify(query.categories), '{"some":{"json":"toInject"}}', 'stringifies as a non-array');

st.deepEqual(
qs.parse('foo[__proto__][hidden]=value&foo[bar]=stuffs', { allowPrototypes: true }),
{
foo: {
bar: 'stuffs'
}
},
'hidden values'
);

st.deepEqual(
qs.parse('foo[__proto__][hidden]=value&foo[bar]=stuffs', { allowPrototypes: true, plainObjects: true }),
{
__proto__: null,
foo: {
__proto__: null,
bar: 'stuffs'
}
},
'hidden values: plain objects'
);

st.end();
});

t.test('can return null objects', { skip: !Object.create }, function (st) {
var expected = Object.create(null);
expected.a = Object.create(null);
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