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Advisory record · GHSA-r9w8-h9r3-54w4

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

CVSS 8.7 HighEPSS 0.0037 · 31st percentile

Published by the GitHub Advisory Database at 1 Oct 2026, 15:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
devaluenpm<5.9.35.9.3
Identifiers
GHSA-r9w8-h9r3-54w4 · CVE-2026-123563
Weakness (CWE)
CWE-789 · CWE-843
Tags
Published
1 Oct 2026
Updated
8 Nov 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The npm package devalue, versions before 5.9.3, is affected: a custom ArrayBuffer reviver can bypass typed-array allocation validation, so the parse function can create very large ArrayBuffers from a very small input. The source says this requires a malformed ArrayBuffer custom reviver under very specific circumstances, and it does not describe what an attacker must control beyond that. Upgrade devalue to version 5.9.3 or later, which is the fixed version listed.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.7 High 4.0 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 CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0037, the 31st percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:34 UTC First seen by agentprime
  2. 31 Oct 2026, 13:34 UTC Confirmed by OSV
  3. 8 Nov 2026, 01:45 UTC Confirmed by the CVE List
  4. 8 Nov 2026, 02:21 UTC Confirmed by NVD

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.