Critical OpenSSL Vulnerability: Heap Buffer Overflow and DTLS Issues
Summary
ALSA-2026:85968: Important: openssl security update. Affects openssl versions < 1:1.1.1k-18.el8_6. Fixed in 1:1.1.1k-18.el8_6. 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, providing a robust general-purpose cryptography library. It is integral to securing communications over networks, ensuring data integrity and confidentiality. However, vulnerabilities in OpenSSL can lead to severe security risks, including unauthorized access and data breaches.
Vulnerability Detail
The identified vulnerabilities in OpenSSL include a heap buffer overflow during CMS key unwrapping (CVE-2026-63072) and an issue with DTLS retransmitting handshake messages from a stale buffer offset (CVE-2026-84782). These vulnerabilities can potentially allow attackers to exploit memory corruption and disrupt secure communications, leading to unauthorized data access or denial of service.
How To Fix
Minimum fixed version
1:1.1.1k-18.el8_6
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, you can limit the use of affected features in OpenSSL until the update is applied. However, the best course of action is to apply the patch as soon as possible.
Conclusion
The vulnerabilities in OpenSSL pose significant risks to secure communications. It is crucial to update the affected packages to the latest patched versions to mitigate these risks effectively. Regular monitoring and prompt action are essential in maintaining security.
See every vulnerability recorded for openssl →
FAQ
OpenSSL is a software library that provides cryptographic functions and protocols for secure communication over networks.
The vulnerabilities can lead to memory corruption, unauthorized data access, and potential denial of service attacks.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without any signup.
If immediate updates are not possible, consider limiting the use of affected features and monitor for any suspicious activity.
For more details, refer to the CVE pages listed in the references section of the vulnerability report.
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