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fix: accept a negative Set-Cookie Max-Age attribute #5571

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fix: accept a negative Set-Cookie Max-Age attribute #5571

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2 changes: 1 addition & 1 deletion lib/web/cookies/parse.js
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Original file line number Diff line number Diff line change
Expand Up @@ -196,7 +196,7 @@ function parseUnparsedAttributes (unparsedAttributes, cookieAttributeList = {})

// 2. If the remainder of attribute-value contains a non-DIGIT
// character, ignore the cookie-av.
if (!/^\d+$/.test(attributeValue)) {

@tsctx tsctx Aug 1, 2026

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Please make the following changes to ensure closer adherence to the specifications.

Suggested change
if (!/^\d+$/.test(attributeValue)) {
if (/[^\d]/.test(attributeValue.slice(1))) {

if (!/^-?\d+$/.test(attributeValue)) {
return parseUnparsedAttributes(unparsedAttributes, cookieAttributeList)
}

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15 changes: 14 additions & 1 deletion test/cookie/cookies.js
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Expand Up @@ -449,9 +449,22 @@ test('Set-Cookie parser', () => {
name: 'Space',
value: 'Cat',
secure: true,
httpOnly: true
httpOnly: true,
maxAge: -1
}])

for (const maxAge of ['-', '--1', '-1a', '+1', '']) {
headers = new Headers({
'set-cookie': `Space=Cat; Secure; HttpOnly; Max-Age=${maxAge}`
})
assert.deepEqual(getSetCookies(headers), [{
name: 'Space',
value: 'Cat',
secure: true,
httpOnly: true
}])
}

headers = new Headers({
'set-cookie': 'Space=Cat; Secure; HttpOnly; Max-Age=2; Domain=deno.land'
})
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