---
id: CVE-2026-100802
title: 'Uninitialized memory in the Graphics: WebGPU component'
summary: >-
  Uninitialized memory in the Graphics: WebGPU component. This vulnerability was
  fixed in Thunderbird 157 and Firefox 157.
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'
cwe:
  - CWE-457
vendor: Mozilla
product: Firefox
affected:
  - Firefox
published: '2026-09-29'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T18:18:09.377'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100802'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=2057833'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-101/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-97/'
    label: security@mozilla.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100802.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-100802'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2543191'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-100802'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100802'
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-97/#CVE-2026-100802'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00241
epssPercentile: 0.1518
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-29T16:25:59.202185Z'
ingestedAt: '2026-09-29T13:34:31.670Z'
scores:
  nvd: 4.3
  vendor: 6.1
---

## Overview

Uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100802.json)