Allocation of Resources Without Limits or Throttling in devalue - CVE-2026-42570
Published: May 16, 2026
Vulnerability identifier: #VU131604
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-42570
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Rich Harris
Affected software:
devalue
devalue
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to excessive memory allocation in devalue.parse when deserializing sparse arrays. A remote attacker can supply a specially crafted sparse array input to cause a denial of service.
The issue can lead to excessive memory consumption due to quirks in some JavaScript engines.
How to mitigate CVE-2026-42570
Install security update from vendor's website.