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Advisories

flat through 6.0.1 Denial of Service via unflatten() Numeric Array Index Keys

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Severity
high
Date
Affecting

  • flat <= 6.0.1

CWE
  • CWE-770 Allocation of Resources Without Limits or Throttling
CVSS
8.2
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
Yu Bao, PayPal Cyber Security Team
Description
flat through 6.0.1 contains an uncontrolled resource allocation vulnerability in unflatten() that allows attackers to create huge sparse arrays via unbounded numeric keys. Attackers can supply flattened keys such as a.4294967294, causing iteration with forEach, spread or JSON.stringify to block the Node.js event loop.

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