Critical Security Update for compat-openssl10: DTLS Handshake Vulnerability
Summary
ALSA-2026:80510: Important: compat-openssl10 security update. Affects compat-openssl10 versions < 1:1.0.2o-4.el8_10.4. Fixed in 1:1.0.2o-4.el8_10.4. How to fix ↓
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Background
The compat-openssl10 package is a compatibility layer for OpenSSL, designed to support applications that rely on older versions of the OpenSSL library. It provides essential cryptographic functions and secure communication protocols, ensuring that legacy software can operate securely in modern environments. However, this package is susceptible to vulnerabilities that can compromise the security of communications, particularly in scenarios involving Datagram Transport Layer Security (DTLS).
Vulnerability Detail
The vulnerability identified as CVE-2026-84782 involves the DTLS protocol, where handshake messages may be retransmitted from a stale buffer offset. This flaw can lead to potential security breaches, allowing attackers to exploit the DTLS handshake process, potentially leading to unauthorized access or data interception. The issue arises from improper handling of message buffers during the handshake process, which can be exploited if an attacker can manipulate the communication flow.
How To Fix
Minimum fixed version
1:1.0.2o-4.el8_10.4
This is the first release that contains the fix.
sudo dnf update compat-openssl10Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, if you cannot update the package immediately, consider disabling DTLS in your applications that rely on the compat-openssl10 package. This can be done by modifying the application configuration to avoid using DTLS features until the update is applied.
Conclusion
The compat-openssl10 package has a critical vulnerability (CVE-2026-84782) that affects the DTLS handshake process. It is crucial to update to the patched version to ensure the security of your applications. In the meantime, consider disabling DTLS as a workaround to mitigate risks.
See every vulnerability recorded for compat-openssl10 →
FAQ
compat-openssl10 is a compatibility package for OpenSSL that allows older applications to function with newer systems without requiring code changes.
CVE-2026-84782 refers to a specific vulnerability in the DTLS protocol implementation in the compat-openssl10 package, which can lead to security risks during the handshake process.
You can use Vulert, which monitors open-source vulnerabilities in your software. By utilizing the Vulert playground, you can check if your application is affected without needing to install any software.
Failing to address this vulnerability may expose your applications to potential attacks, including unauthorized access and data interception, compromising the security of your communications.
Yes, you can temporarily disable DTLS in your applications to mitigate the risk until you can apply the necessary updates.
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