GHSA-wf3x-273g-mvxv: devalue Sparse Arrays Emitted By Uneval Vulnerability

LOW
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CWE-789 CWE-400
Published
Advisory Summary

GHSA-wf3x-273g-mvxv is a LOW sparse arrays emitted by uneval vulnerability (CWE-789: Memory Allocation with Excessive Size Value) affecting devalue libraries in the npm ecosystem. The issue involves sparse arrays emitted by uneval cause eager allocation when evaluated. Remediation is available by upgrading affected packages to version 5.9.3.

GHSA-wf3x-273g-mvxv at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-wf3x-273g-mvxv
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-789: Memory Allocation with Excessive Size Value
Affected Product devalue
Package Ecosystem npm
Published Date
Last Updated

How to Fix GHSA-wf3x-273g-mvxv

To remediate this vulnerability, upgrade all affected devalue dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

devalue fixed: 5.9.3 
npm install devalue@5.9.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls devalue

How to Check if You Are Affected

To determine whether your Node.js application is affected by GHSA-wf3x-273g-mvxv, inspect your project dependencies using npm:

npm ls devalue

Analyze the terminal output to locate any version of devalue in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.9.3), your application is affected.

Note: The npm ls devalue command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-789: Memory Allocation with Excessive Size Value, where the product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. In devalue, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Evaluating legitimate `uneval` output for a sparse array can allocate memory proportional to its declared length. A tiny serialized value can therefore cause large memory allocation in a consuming browser/runtime. This occurs during evaluation of generated code, not in default `parse` sparse-array construction. You would only be affected by this if you were serializing very large sparse arrays and then evaluating the results. In the general use case for `uneval` of sending data to the client, the worst that could happen is the browser tab running out of memory.

GHSA-wf3x-273g-mvxv Affected devalue Versions

1 component(s)
Fixed Versions:
5.9.3
Product / Package Ecosystem Affected Versions Fixed Version
devalue
npm/devalue
npm
≥ 1.0.0
< 5.9.3
5.9.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/sveltejs/devalue/security/advisories/GHSA-wf3x-273g-mvxv
Security Fix Commit FIX COMMIT
https://github.com/sveltejs/devalue/commit/6861dbbb7e548849e48bce718e88747a298f7250
devalue Source Repository REPOSITORY
https://github.com/sveltejs/devalue
devalue Release RELEASE
https://github.com/sveltejs/devalue/releases/tag/v5.9.3

Frequently Asked Questions

What is GHSA-wf3x-273g-mvxv?
GHSA-wf3x-273g-mvxv is a security vulnerability in devalue involving Sparse arrays emitted by uneval cause eager allocation when evaluated under CWE-789: Memory Allocation with Excessive Size Value.
Which devalue versions are affected?
Affected versions include releases prior to 5.9.3 across affected packages: devalue.
What version fixes GHSA-wf3x-273g-mvxv?
Upgrading to 5.9.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is devalue affected?
Yes, devalue is affected in releases prior to 5.9.3. Upgrade your dependency to 5.9.3 or later.
What CWE is associated with GHSA-wf3x-273g-mvxv?
GHSA-wf3x-273g-mvxv is classified under CWE-789: Memory Allocation with Excessive Size Value (The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.).
How can I check npm dependencies for GHSA-wf3x-273g-mvxv?
Run the dependency tree command: 'npm ls devalue'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-wf3x-273g-mvxv",
  "modified" : "2026-10-01T15:17:13Z",
  "published" : "2026-10-01T15:17:13Z",
  "aliases" : [ ],
  "summary" : "devalue: Sparse arrays emitted by uneval cause eager allocation when evaluated",
  "details" : "Evaluating legitimate `uneval` output for a sparse array can allocate memory proportional to its declared length. A tiny serialized value can therefore cause large memory allocation in a consuming browser/runtime. This occurs during evaluation of generated code, not in default `parse` sparse-array construction.\n\nYou would only be affected by this if you were serializing very large sparse arrays and then evaluating the results. In the general use case for `uneval` of sending data to the client, the worst that could happen is the browser tab running out of memory.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "devalue"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0"
      }, {
        "fixed" : "5.9.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.9.2"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/sveltejs/devalue/security/advisories/GHSA-wf3x-273g-mvxv"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sveltejs/devalue/commit/6861dbbb7e548849e48bce718e88747a298f7250"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/sveltejs/devalue"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sveltejs/devalue/releases/tag/v5.9.3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400", "CWE-789" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-01T15:17:13Z",
    "nvd_published_at" : null
  }
}