Critical OpenSSL Vulnerabilities in AlmaLinux 9: Security Update Required
Summary
ALSA-2026:25239: Important: openssl security update. Affects openssl versions < 1:3.5.5-4.el9_8. Fixed in 1:3.5.5-4.el9_8. How to fix ↓
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Background
OpenSSL is a widely-used toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, along with a comprehensive general-purpose cryptography library. It is essential for securing communications over computer networks. The recent vulnerabilities identified in OpenSSL pose significant risks, including potential denial of service and information disclosure, making it crucial for users to address these issues promptly.
Vulnerability Detail
The vulnerabilities stem from various flaws in OpenSSL, including a heap buffer overflow due to signed integer overflow in Unicode output sizing (CVE-2026-7383), a denial of service caused by heap out-of-bounds read in CMS password-based decryption (CVE-2026-9076), and multiple NULL pointer dereferences that could lead to application crashes or security breaches. These vulnerabilities can be exploited by attackers to compromise system integrity, leading to unauthorized access or service disruption.
How To Fix
Minimum fixed version
1:3.5.5-4.el9_8
This is the first release that contains the fix.
sudo dnf update opensslTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, users can limit access to the affected services or implement network-level protections to mitigate the risk of exploitation until the update is applied.
Conclusion
The identified vulnerabilities in OpenSSL for AlmaLinux 9 are critical and require immediate attention. Users must update their packages to the latest patched version to safeguard their systems against potential exploits. Utilizing tools like Vulert can further enhance security by providing real-time monitoring for vulnerabilities.
See every vulnerability recorded for openssl →
FAQ
The main vulnerabilities include heap buffer overflows, denial of service issues, and NULL pointer dereferences, which can lead to crashes and unauthorized access.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by these vulnerabilities without needing to sign up.
If an immediate update is not possible, consider implementing network-level protections or limiting access to the affected services as a temporary workaround.
While specific exploits may not be publicly available, the vulnerabilities present significant risks that could be leveraged by attackers to compromise systems.
Vulert is a tool that monitors and alerts for open-source vulnerabilities in your software using just a manifest file like package-lock.json, allowing for real-time vulnerability management.
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