Moderate Vulnerability in OpenSSL: Information Disclosure from Uninitialized Memory
Summary
ALSA-2026:19218: Moderate: openssl security update. Affects openssl versions < 1:3.5.5-2.el9_8. Fixed in 1:3.5.5-2.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. It is integral to many applications and systems, ensuring data integrity and confidentiality. However, OpenSSL can be vulnerable to various security issues, including the recent information disclosure vulnerability linked to uninitialized memory when handling invalid RSA public keys.
Vulnerability Detail
The vulnerability identified as CVE-2026-31790 allows for information disclosure from uninitialized memory when an invalid RSA public key is processed. This could potentially expose sensitive data, leading to unauthorized access or data leakage. The issue arises from how OpenSSL handles memory allocation and initialization, making it critical for users to address this vulnerability promptly to safeguard their systems.
How To Fix
Minimum fixed version
1:3.5.5-2.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, users may consider avoiding the use of invalid RSA public keys in their applications until the package is updated. However, this does not eliminate the underlying vulnerability and should not be seen as a permanent solution.
Conclusion
The OpenSSL vulnerability CVE-2026-31790 poses a moderate risk due to potential information disclosure from uninitialized memory. It is crucial for users to update their OpenSSL packages to the patched version to mitigate this risk and ensure the security of their applications.
See every vulnerability recorded for openssl →
FAQ
CVE-2026-31790 is a vulnerability in OpenSSL that allows for information disclosure from uninitialized memory when processing invalid RSA public keys.
If your application uses OpenSSL and processes RSA public keys, it may be at risk of exposing sensitive data due to this vulnerability.
As a temporary measure, avoid using invalid RSA public keys in your applications until you can apply the necessary updates.
For detailed information, refer to the CVE page associated with CVE-2026-31790 and the OpenSSL advisory.
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