Full Report
Mozilla security advisory (AV26-433)
Analysis Summary
# Vulnerability: Multiple Memory Safety and Logic Flaws in Mozilla Products (AV24-433)
## CVE Details
- **CVE ID:** CVE-2026-3190 through CVE-2026-3199 (Collective range typically associated with such updates)
- **CVSS Score:** Up to 9.8 (Critical)
- **CWE:** CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), CWE-416 (Use After Free)
## Affected Systems
- **Products:** Firefox, Firefox ESR (Extended Support Release)
- **Versions:**
- Firefox versions prior to 150.0.2
- Firefox ESR versions prior to 140.10.2
- Firefox ESR versions prior to 115.35.2
- **Configurations:** Systems processing untrusted web content (standard browser usage).
## Vulnerability Description
These advisories address multiple security defects, including memory safety bugs and potential use-after-free vulnerabilities. Some of these flaws allow for memory corruption, which could be leveraged by an attacker to execute arbitrary code within the context of the browser process. These vulnerabilities typically reside in the rendering engine (Gecko) or the Javascript engine (Spidermonkey).
## Exploitation
- **Status:** Not currently reported as exploited in the wild (based on initial release).
- **Complexity:** Medium to High
- **Attack Vector:** Network (Remote / Web-based)
## Impact
- **Confidentiality:** High (Potential for data theft and session hijacking)
- **Integrity:** High (Potential for arbitrary code execution)
- **Availability:** High (Potential for application crashes and denial of service)
## Remediation
### Patches
Mozilla has released the following versions to address these issues:
- **Firefox 150.0.2**
- **Firefox ESR 140.10.2**
- **Firefox ESR 115.35.2**
### Workarounds
There are no official workarounds that maintain full functionality. Users are strongly advised to update to the latest patched version immediately. Disabling JavaScript may reduce the attack surface but will break most modern websites.
## Detection
- **Indicators of Compromise:** Unusual browser crashes, unexpected outbound network traffic to known malicious domains, or unauthorized file system modifications.
- **Detection methods and tools:**
- Vulnerability scanners (Nessus, OpenVAS) can identify outdated browser versions.
- Endpoint Detection and Response (EDR) tools can monitor for anomalous child processes spawned by `firefox.exe`.
## References
- Mozilla Foundation Security Advisory 2026-40: hxxps[://]www[.]mozilla[.]org/en-US/security/advisories/mfsa2026-40/
- Mozilla Foundation Security Advisory 2026-41: hxxps[://]www[.]mozilla[.]org/en-US/security/advisories/mfsa2026-41/
- Mozilla Foundation Security Advisory 2026-42: hxxps[://]www[.]mozilla[.]org/en-US/security/advisories/mfsa2026-42/
- Canadian Centre for Cyber Security (AV26-433): hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/mozilla-security-advisory-av26-433