Critical Security Update for OpenSSL: DTLS Handshake Vulnerability
Summary
ALSA-2026:77396: Important: openssl security update. Affects openssl versions < 1:3.5.8-2.el9_8. Fixed in 1:3.5.8-2.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, providing essential cryptographic functions for secure communications over networks. The affected packages include openssl, openssl-devel, openssl-libs, and openssl-perl, all of which are integral to various applications and services that rely on secure data transmission. This vulnerability specifically impacts the handling of DTLS handshake messages, potentially exposing systems to security risks.
Vulnerability Detail
The vulnerability identified as CVE-2026-84782 arises from OpenSSL's handling of DTLS retransmissions. It allows the library to send handshake messages from a stale buffer offset, which can lead to unexpected behavior and potential security breaches. This flaw could be exploited by attackers to manipulate the handshake process, resulting in unauthorized access or data interception during secure communications.
How To Fix
Minimum fixed version
1:3.5.8-2.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 workaround, consider disabling DTLS support in applications that do not require it. This can help mitigate the risk until the packages are updated. However, this is not a permanent solution and updating the packages is strongly recommended.
Conclusion
The OpenSSL vulnerability CVE-2026-84782 poses significant security risks due to improper handling of DTLS handshake messages. It is crucial to update affected packages to the latest patched versions to safeguard your systems. Regular monitoring and updates are essential to maintain security in your applications.
See every vulnerability recorded for openssl →
FAQ
CVE-2026-84782 is a vulnerability in OpenSSL that affects the handling of DTLS handshake messages, potentially allowing attackers to exploit stale buffer offsets.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The risks include unauthorized access to secure communications and potential data interception, which can compromise sensitive information.
It is recommended to regularly check for updates and apply them promptly to ensure your systems are protected against known vulnerabilities.
If immediate updates are not possible, consider disabling DTLS support as a temporary workaround until you can apply the necessary patches.
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