Critical Security Flaw in Firefox: Multiple Vulnerabilities Addressed
Summary
RLSA-2026:10767: Important: firefox security update. Affects firefox versions < 0:140.10.0-1.el10_1. Fixed in 0:140.10.0-1.el10_1. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
Mozilla Firefox is a widely-used open-source web browser known for its commitment to standards compliance, performance, and portability. It supports various web technologies and is favored for its privacy features. However, recent vulnerabilities have been identified that could compromise user security and privacy, necessitating immediate attention and updates.
Vulnerability Detail
The vulnerabilities in Mozilla Firefox stem from various components, including incorrect boundary conditions, use-after-free errors, and memory safety issues. These flaws could lead to privilege escalation, information disclosure, and potential exploitation by malicious actors. The vulnerabilities are cataloged under multiple CVEs, with a CVSS score of 7.5, indicating a high severity level. Users are at risk of data leaks, unauthorized access, and other security breaches if these vulnerabilities are not addressed promptly.
How To Fix
Minimum fixed version
0:140.10.0-1.el10_1
This is the first release that contains the fix.
sudo dnf update firefoxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, users can disable certain features in Firefox that may be exploited until the update is applied. For example, disabling WebRTC can mitigate some risks associated with the vulnerabilities. This can be done by navigating to 'about:config' in the Firefox address bar and setting 'media.peerconnection.enabled' to false.
Conclusion
The recent vulnerabilities in Mozilla Firefox highlight the importance of keeping software up to date to protect against potential security threats. Users are encouraged to update their installations promptly and consider using tools like Vulert for ongoing monitoring of vulnerabilities in their applications.
See every vulnerability recorded for firefox →
FAQ
The update addresses multiple vulnerabilities, including use-after-free errors, incorrect boundary conditions, and memory safety issues across various components.
You can verify your Firefox version by navigating to 'Help' > 'About Firefox'. Compare it with the patched version mentioned in the update details.
The CVSS score for this vulnerability is 7.5, indicating a high severity level that requires immediate attention.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in your software using a manifest file. You can check your application for vulnerabilities without signing up at the Vulert playground.
If you cannot update immediately, consider disabling vulnerable features as a temporary workaround and ensure to update as soon as possible.
References
Related vulnerabilities
Recent vulnerabilities recorded for firefox.
