AIKIDO-2026-54683
undici is vulnerable to Uncontrolled Recursion
52
Medium Risk
This Affects:
undiciTL;DR
parseUnparsedAttributes in lib/web/cookies/parse.js recursed once per Set-Cookie attribute with no depth bound. A single response header of the form a=b;;;;... overflowed the JavaScript call stack and threw an uncaught RangeError: Maximum call stack size exceeded out of getSetCookies. An application that parses Set-Cookie headers from an untrusted peer can be crashed by thousands of empty attribute separators. The fix converts the algorithm to an iterative loop so the parser no longer grows the stack per attribute.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and parse Set-Cookie headers from untrusted responses, for example via getSetCookies or parseSetCookie.
Background info
undici is vulnerable to Uncontrolled Recursion in versions 5.15.0 - 8.10.1.
How to fix this
Upgrade the undici library to the patch version.
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