Mozilla Firefox and Thunderbird WebGPU IPC Use-After-Free Remote Code Execution and Sandbox Escape (CVE-2022-26486)
Executive & SecOps Summary
SECOPS ASSESSMENTFirefox < 97.0.2, Firefox ESR < 91.6.1, Firefox for Android < 97.3.0, Thunderbird < 91.6.2, and Focus < 97.3.0
Attackers can trigger a Use-After-Free (UAF) condition via crafted web content, leading to arbitrary code execution and a complete sandbox escape on the host OS
Immediately update all affected Mozilla products to their respective patched versions (Firefox 97.0.2+, Firefox ESR 91.6.1+, Thunderbird 91.6.2+, etc.)
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
For Debian/Ubuntu-based Linux distributions, update the packages immediately using the package manager:
# Update package lists and upgrade Firefox/Thunderbird
sudo apt-get update && sudo apt-get --only-upgrade install -y firefox thunderbirdFor RedHat/CentOS-based systems, execute the following command:
# Upgrade packages via dnf
sudo dnf upgrade -y firefox thunderbird2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, disable WebGPU features via enterprise policy configuration (policies.json) to mitigate the attack vector:
{
'policies': {
'Preferences': {
'dom.webgpu.enabled': false,
'gfx.webgpu.enabled': false
}
}
}3. Log Audit & IoC Verification Commands
Use the following script to audit the installed versions of Firefox and identify potential exposure:
# Check installed Firefox version and verify vulnerability status
ff_version=$(firefox --version 2>/dev/null | awk '{print $3}')
if [ ! -z '$ff_version' ]; then
echo 'Current Firefox Version: '$ff_version
# Compare version to ensure it is above the vulnerable threshold
dpkg --compare-versions '$ff_version' 'lt' '97.0.2' && echo '[WARNING] Action Required: Vulnerable version detected!' || echo '[OK] Secure version installed.'
fiBlock Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2022-26486) is a critical Use-After-Free (UAF) flaw residing within the WebGPU IPC (Inter-Process Communication) framework of Mozilla products. The root cause lies in the improper lifecycle management of objects during the processing of WebGPU specifications. When an unexpected or out-of-order IPC message is received, the framework fails to invalidate references to memory blocks that have already been freed, resulting in memory corruption.
2. Exploitation Mechanics & Attack Scenario
An attacker exploits this vulnerability by enticing a victim to visit a malicious website or open a crafted email containing active web content. Once rendered, the content process sends anomalous IPC messages to the GPU or parent process. This triggers the UAF state, allowing the attacker to overwrite the freed memory space with controlled payloads. By hijacking function pointers, the attacker bypasses the browser's sandbox boundaries (Sandbox Escape) and executes arbitrary code with the privileges of the host process.
3. Infrastructure & Business Impact
As this vulnerability is actively exploited in the wild and listed in the CISA KEV catalog, it poses an immediate threat to enterprise environments. Successful exploitation leads to full compromise of the user's endpoint. This can serve as an initial entry point for lateral movement, ransomware deployment, and sensitive corporate data exfiltration.
Official Vendor Advisories & References
An unexpected message in the WebGPU IPC framework could lead to a use-after-free and exploitable sandbox escape. We have had reports of attacks in the wild abusing this flaw. This vulnerability affects Firefox < 97.0.2, Firefox ESR < 91.6.1, Firefox for Android < 97.3.0, Thunderbird < 91.6.2, and Focus < 97.3.0.
Frequently Asked SecOps Questions (CVE-2022-26486)
FAQQ1. How critical is CVE-2022-26486 and is it actively exploited in the wild?
CVE-2022-26486 is rated CVSS 9.6 (CRITICAL) with a 30-day EPSS exploitation probability of 2.4%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2022-26486?
Primary impacted vendors include mozilla across firefox, firefox_esr, firefox_for_android, thunderbird, focus. Scope summary: Firefox < 97.0.2, Firefox ESR < 91.6.1, Firefox for Android < 97.3.0, Thunderbird < 91.6.2, and Focus < 97.3.0
Q3. What temporary mitigations or workarounds exist for CVE-2022-26486 before patching?
[Mitigation] Immediately update all affected Mozilla products to their respective patched versions (Firefox 97.0.2+, Firefox ESR 91.6.1+, Thunderbird 91.6.2+, etc.) Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2022-26486
Instantly format this advisory into an executive CISO summary or engineering patch ticket.
🔗 Related Advisories in Similar Stack (mozilla)
View Category →Google Chrome Dawn Use-After-Free Vulnerability (CVE-2026-5281) Technical Advisory
[Affected Scope] Google Chrome versions prior to 146.0.7680.178
Windows AFD.sys Use-After-Free Local Privilege Escalation Vulnerability (CVE-2026-68820) Security Advisory
[Affected Scope] Systems running Microsoft Windows operating systems utilizing the Ancillary Function Driver for WinSock (afd.sys)
Apple macOS Screen Sharing Authentication Bypass Vulnerability (CVE-2026-65400)
[Affected Scope] macOS systems running versions prior to Sequoia 15.7.9, Sonoma 14.8.9, Tahoe 26.6.1/26.7, or Golden Gate 27 with Screen Sharing or VNC services enabled
DAEMON Tools Lite Official Installer Supply Chain Attack and Trojanized Binaries (CVE-2026-8398)
[Affected Scope] DAEMON Tools Lite Windows versions 12.5.0.2421 through 12.5.0.2434 distributed between April 8, 2026, and May 5, 2026
Subscribe to Daily Vulnerability Briefings & KEV Alerts
Concise morning briefings for SecOps, DevSecOps, and SRE teams covering newly exploited CVEs and mitigation priorities.