CVE-2026-2794
📋 TL;DR
This vulnerability allows attackers to read uninitialized memory in Firefox and Firefox Focus for Android, potentially exposing sensitive information. It affects all users running Firefox versions below 148 on Android devices.
💻 Affected Systems
- Firefox for Android
- Firefox Focus for Android
📦 What is this software?
Firefox by Mozilla
⚠️ Risk & Real-World Impact
Worst Case
Attackers could extract sensitive data like passwords, session tokens, or other application memory contents from the browser process.
Likely Case
Information disclosure of browser memory contents, potentially including fragments of user data or system information.
If Mitigated
Limited information exposure with proper browser sandboxing and memory protection mechanisms in place.
🎯 Exploit Status
Exploitation requires user interaction (visiting malicious website) but no authentication. Memory disclosure vulnerabilities typically require specific conditions to extract useful information.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firefox 148
Vendor Advisory: https://www.mozilla.org/security/advisories/mfsa2026-13/
Restart Required: Yes
Instructions:
1. Open Google Play Store 2. Search for Firefox or Firefox Focus 3. Tap Update 4. Restart browser after update completes
🔧 Temporary Workarounds
Disable JavaScript
androidPrevents exploitation through malicious websites
about:config → javascript.enabled = false
🧯 If You Can't Patch
- Restrict browser usage to trusted websites only
- Use alternative browser until patch can be applied
🔍 How to Verify
Check if Vulnerable:
Open Firefox → Menu → Settings → About Firefox → Check version numberCheck Version:
about:Verify Fix Applied:
Confirm version is 148 or higher in About Firefox📡 Detection & Monitoring
Log Indicators:
- Unusual memory access patterns
- Browser crash reports with memory errors
Network Indicators:
- Connections to known malicious domains serving exploit code
SIEM Query:
source="firefox" AND (event="crash" OR event="memory_error")