GitHub Advisoryadvisory · npm

GHSA-hx4r-w6wj-j8fg devalue: Residual sparse-array CPU amplification in uneval

MEDIUM Published 2026-10-01 Modified 2026-10-01 Official page ↗
Ecosystem
npm
Packages
devalue
Severity
Moderate
CVSS vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weaknesses
CWE-400, CWE-407
Reviewed
2026-10-01

Affected packages

• npm devalue: < 5.9.3 → fixed in 5.9.3

Description

`uneval` performs synchronous work proportional to a sparse array's declared length. An application that passes attacker-influenced sparse values to `uneval` can suffer event-loop blocking. Since attacker-controlled creation of sparse arrays is so difficult, this vulnerability is very difficult to exploit.

Related

Weakness · CWE (2)

  • CWE-400 Uncontrolled Resource Consumption weakness
  • CWE-407 Inefficient Algorithmic Complexity weakness

References