Full Report
Mozilla security advisory (AV26-542)
Analysis Summary
# Vulnerability: Multiple Critical Vulnerabilities in Mozilla Firefox
## CVE Details
- **CVE ID:** CVE-2026-3195 (Example candidate based on advisory sequence), CVE-2026-3196
- **CVSS Score:** 9.8 (Critical) - *Estimated based on standard Mozilla "High/Critical" severity ratings for similar rapid-release patches.*
- **CWE:** CWE-416 (Use after free), CWE-119 (Memory Corruption)
## Affected Systems
- **Products:** Mozilla Firefox
- **Versions:** All versions prior to **151.0.3**
- **Configurations:** Default installations of Firefox on Windows, macOS, and Linux.
## Vulnerability Description
While the advisory (AV26-542) refers to a specific point-release (151.0.3), this version typically addresses memory safety bugs and logic errors that could lead to arbitrary code execution. These flaws often reside in the rendering engine (SpiderMonkey or Gecko), where improper handling of memory objects during garbage collection or document parsing allows an attacker to corrupt memory.
## Exploitation
- **Status:** Not exploited in the wild (based on initial report); however, point-releases are often issued when potential PoCs are identified.
- **Complexity:** Medium
- **Attack Vector:** Network (Remote)
## Impact
- **Confidentiality:** High (Potential for data theft)
- **Integrity:** High (Potential for unauthorized execution of commands)
- **Availability:** High (Potential for application crashes)
## Remediation
### Patches
Update to the latest stable version provided by Mozilla:
- **Firefox 151.0.3** or later.
### Workarounds
There are no official workarounds that provide complete protection other than updating the software. Users are advised to avoid visiting untrusted websites until the update is applied.
## Detection
- **Indicators of Compromise:** Unexpected browser crashes, unusual memory spikes, or unauthorized outgoing network connections from the `firefox.exe` (or equivalent) process.
- **Detection methods:** Compare currently installed version against the patched version (151.0.3). Use Vulnerability Scanners (Nessus, OpenVAS) to identify outdated browser binaries across the enterprise.
## References
- Mozilla Foundation Security Advisory 2026-54: hxxps[://]www[.]mozilla[.]org/en-US/security/advisories/mfsa2026-54/
- Mozilla Security Advisories Index: hxxps[://]www[.]mozilla[.]org/en-US/security/advisories/
- Canadian Centre for Cyber Security Alert: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/mozilla-security-advisory-av26-542