---
id: CVE-2026-88378
title: >-
  QuickJS commit 04be24600 contains a heap out-of-bounds write condition in
  JS_ReadFunctionTag().
summary: >-
  QuickJS commit 04be24600 contains a heap out-of-bounds write condition in
  JS_ReadFunctionTag().
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-787
published: '2026-09-24'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T03:17:21.100'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88378'
references:
  - url: 'https://github.com/bellard/quickjs/issues/549'
    label: cve@mitre.org
  - url: 'https://github.com/bellard/quickjs/pull/553'
    label: cve@mitre.org
  - url: >-
      https://github.com/bellard/quickjs/pull/553/changes/42526037cfc0b2a94a875c0de0f4bbeaf597a542
    label: cve@mitre.org
  - url: 'https://github.com/bellard/quickjs/issues/549'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-29T02:31:06.896356Z'
ingestedAt: '2026-09-24T16:47:15.853Z'
epss: 0.00562
epssPercentile: 0.46526
---

## Overview

QuickJS commit 04be24600 contains a heap out-of-bounds write condition in JS_ReadFunctionTag().

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.