CVE-2026-7324: Firefox 150 RCE Vulnerability

CVE-2026-7324 Overview

Memory safety bugs present in Firefox 150.0.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.1.

Critical Impact
Memory corruption vulnerabilities in Firefox 150.0.0 could potentially allow attackers to execute arbitrary code through a network-based attack vector, compromising user systems without requiring any special privileges.

Affected Products

Mozilla Firefox 150.0.0

Discovery Timeline

2026-04-28 - CVE CVE-2026-7324 published to NVD
2026-04-28 - Last updated in NVD database

Technical Details for CVE-2026-7324

Vulnerability Analysis

CVE-2026-7324 represents a collection of memory safety bugs discovered in Mozilla Firefox version 150.0.0. These vulnerabilities fall under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), indicating issues with how the browser handles memory operations at buffer boundaries.

The memory corruption evidence suggests that Firefox's memory management routines contained flaws that could lead to unpredictable behavior when processing certain inputs. Mozilla's internal security team identified multiple related bugs (tracked as 2029419, 2029717, 2029769, and 2029886) that collectively contribute to this security issue.

The vulnerability is exploitable over the network without requiring user authentication or elevated privileges. While the impact on confidentiality, integrity, and availability is partial, the ease of exploitation combined with Firefox's widespread deployment makes this a significant concern for enterprise and individual users alike.

Root Cause

The root cause stems from improper restriction of operations within memory buffer boundaries (CWE-119). This class of vulnerability occurs when software performs operations on a memory buffer but allows reading or writing of data beyond the buffer's intended boundaries. In Firefox 150.0.0, these memory safety issues could manifest during typical browsing activities when processing malformed or specially crafted content.

Attack Vector

The attack vector for CVE-2026-7324 is network-based, meaning an attacker could exploit this vulnerability remotely without requiring physical access to the target system. Exploitation would likely involve:

An attacker crafting malicious web content designed to trigger the memory corruption bugs
A victim visiting a compromised or attacker-controlled website using Firefox 150.0.0
The malicious content triggering memory safety issues during rendering or processing
Successful exploitation potentially leading to arbitrary code execution within the browser context

No authentication is required, and no user interaction beyond visiting the malicious page would be needed. The technical details of specific exploitation techniques can be found in the Mozilla Bug List Report.

Detection Methods for CVE-2026-7324

Indicators of Compromise

Presence of Firefox version 150.0.0 installed on endpoint systems
Unusual browser crashes or memory access violations in Firefox processes
Suspicious network traffic patterns from Firefox to unknown or malicious domains
Anomalous memory allocation patterns in browser telemetry

Detection Strategies

Deploy endpoint detection rules to identify Firefox 150.0.0 installations across the network
Monitor for abnormal Firefox process behavior including unexpected crashes, high memory usage, or spawning of child processes
Implement network-based detection for known malicious domains that may host exploit code
Utilize memory forensics capabilities to identify signs of memory corruption exploitation

Monitoring Recommendations

Enable Firefox crash reporting and analyze crash dumps for signs of exploitation attempts
Configure SIEM rules to alert on multiple Firefox crashes from single endpoints
Monitor outbound connections from Firefox processes for suspicious communication patterns
Review endpoint logs for evidence of code execution following browser crashes

How to Mitigate CVE-2026-7324

Immediate Actions Required

Update Mozilla Firefox to version 150.0.1 or later immediately
Audit all endpoints to identify systems running the vulnerable Firefox 150.0.0 version
Consider temporarily using alternative browsers until patching is complete in high-risk environments
Enable automatic updates for Firefox to prevent future delays in security patch deployment

Patch Information

Mozilla has released Firefox version 150.0.1 which addresses these memory safety bugs. The official security advisory is available at the Mozilla Security Advisory MFSA-2026-35. Organizations should prioritize deployment of this update across all managed endpoints.

The patch addresses multiple bugs including 2029419, 2029717, 2029769, and 2029886 as documented in the Mozilla Bug List Report.

Workarounds

Deploy web filtering or proxy solutions to block access to known malicious domains
Implement browser isolation technologies to contain potential exploitation
Restrict Firefox usage to trusted websites only until patching is complete
Consider disabling JavaScript execution as a temporary mitigation, though this may impact web functionality

bash

# Firefox version check and update command
# Check current Firefox version
firefox --version

# On Linux systems, update Firefox via package manager
# Debian/Ubuntu:
sudo apt update && sudo apt upgrade firefox

# Fedora/RHEL:
sudo dnf update firefox

# Verify updated version is 150.0.1 or later
firefox --version