Bug 2487050 (CVE-2026-42570)

Summary: CVE-2026-42570 devalue: devalue: Excessive memory consumption via deserialization of sparse arrays
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: cdrage, eborisov, lball, ngough, rushinde, veshanka
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in devalue, a JavaScript library used for serializing values. Due to quirks in some JavaScript engines, the `devalue.parse` function could be exploited by a remote attacker when deserializing specially crafted sparse arrays. This could lead to excessive memory consumption, resulting in a Denial of Service (DoS) for the affected system.
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Description OSIDB Bzimport 2026-06-09 17:01:40 UTC 
Svelte devalue is a JavaScript library that serializes values into strings when JSON.stringify isn't sufficient for the job. From version 5.6.3 to before version 5.8.1, devalue.parse could, due to quirks in some JavaScript engines, be convinced to allocate much more memory than was needed when deserializing sparse arrays, leading to excessive memory consumption. This issue has been patched in version 5.8.1.