---
id: "GHSA-r9w8-h9r3-54w4"
kind: "vulnerability"
aliases: ["GHSA-r9w8-h9r3-54w4"]
title: "devalue: Custom ArrayBuffer revivers can bypass typed-array allocation validation"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "devalue", "fixed": ["5.9.3"], "affected": "<= 5.9.2", "ecosystem": "npm"}]
ecosystems: ["npm"]
tags: ["cwe-789", "cwe-843", "javascript", "node.js", "npm", "package", "sveltekit"]
not_affected_if: ["no-custom-arraybuffer-reviver", "no-untrusted-input-to-parse", "version-5.9.3-or-later"]
published_at: "2026-10-01T15:15:56+00:00"
first_seen_at: "2026-10-23T19:11:32+00:00"
updated_at: "2026-10-23T20:20:15+00:00"
sources: [{"source": "ghsa", "url": "https://github.com/advisories/GHSA-r9w8-h9r3-54w4", "first_seen_at": "2026-10-23T19:11:32+00:00"}]
---

# devalue: Custom ArrayBuffer revivers can bypass typed-array allocation validation

devalue is a JavaScript library for serializing and parsing data, and versions up to 5.9.2 let a crafted small input make parse allocate very large ArrayBuffers when a custom ArrayBuffer reviver is used. An attacker who can supply the input can exhaust memory and crash the process (denial of service).

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- npm:devalue affected <= 5.9.2 fixed 5.9.3

## How to check

Run npm ls devalue to find installed versions and check whether any is 5.9.2 or lower.
Check whether code calls devalue.parse with a custom reviver that handles ArrayBuffer.

## Fix

Upgrade devalue to 5.9.3 or later.
Rebuild and redeploy after the upgrade.

## Timeline

- 2026-10-23T19:11:32+00:00 ghsa https://github.com/advisories/GHSA-r9w8-h9r3-54w4

## From the sources

Under very specific circumstances, `parse` could create massive ArrayBuffers with very small input. This required a malformed `ArrayBuffer` custom reviver.

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