Critical Security Update for Brotli Package: CVE-2025-6176
Summary
RHSA-2026:2455: Red Hat Security Advisory: brotli security update. Affects brotli versions < 0:1.0.6-4.el8_6. Fixed in 0:1.0.6-4.el8_6. How to fix ↓
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Background
Brotli is a widely used compression algorithm that is particularly effective for web content. It is implemented in various applications to enhance data transmission efficiency. The package is essential for developers looking to optimize web performance and reduce bandwidth usage. However, recent vulnerabilities have raised concerns about its security, necessitating immediate attention from users and administrators.
Vulnerability Detail
The vulnerability identified as CVE-2025-6176 affects the Brotli package, allowing potential attackers to exploit weaknesses in the compression algorithm. This could lead to unauthorized access to sensitive data or denial of service attacks. The flaw originates from improper handling of certain input data, which can be manipulated to cause unexpected behavior in applications relying on Brotli for data compression. The ramifications of this vulnerability are severe, as it could compromise the integrity and confidentiality of data processed by affected applications.
How To Fix
Minimum fixed version
0:1.0.6-4.el8_6
This is the first release that contains the fix.
sudo dnf update brotliTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, users can disable Brotli compression in their applications until the package is updated. This can be done by modifying the server configuration to bypass Brotli for content delivery.
Conclusion
The Brotli package is essential for efficient data compression, but the recent CVE-2025-6176 vulnerability poses significant risks. Users must update to the patched version to safeguard their applications and data. Utilizing tools like Vulert can help in monitoring and managing vulnerabilities effectively.
See every vulnerability recorded for brotli →
FAQ
CVE-2025-6176 is a security vulnerability in the Brotli compression package that can lead to unauthorized data access or denial of service.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Failing to update Brotli exposes your application to potential data breaches and service disruptions, compromising user trust and data integrity.
Yes, Vulert can monitor and alert you in real-time for open-source vulnerabilities using just a manifest file like package-lock.json.
The CVSS score for CVE-2025-6176 is 7.5, indicating a high severity level that requires prompt action.
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