Moderate Security Vulnerability in libgcrypt: Denial of Service and Buffer Overflow
Summary
ALSA-2026:50147: Moderate: libgcrypt security update. Affects libgcrypt versions < 1.10.0-13.el9_8. Fixed in 1.10.0-13.el9_8. How to fix ↓
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Background
libgcrypt is a general-purpose cryptographic library that provides implementations of various cryptographic algorithms. It is widely used in applications requiring secure data encryption and decryption. The library is essential for maintaining data integrity and confidentiality, making it a critical component in many software systems. However, vulnerabilities in such libraries can lead to severe security risks, including unauthorized data access and service disruptions.
Vulnerability Detail
The vulnerability identified as CVE-2026-41989 in libgcrypt allows for a Denial of Service (DoS) attack and a buffer overflow through crafted ECDH (Elliptic Curve Diffie-Hellman) ciphertext. This issue arises from improper handling of specific inputs, which can lead to application crashes or unexpected behavior, potentially exposing sensitive data or allowing attackers to exploit the system further.
How To Fix
Minimum fixed version
1.10.0-13.el9_8
This is the first release that contains the fix.
sudo dnf update libgcryptTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, if immediate updating is not feasible, consider restricting access to the affected services or implementing input validation to prevent the processing of potentially malicious ECDH ciphertext. However, these are not long-term solutions and should be followed by an update as soon as possible.
Conclusion
The libgcrypt library has a moderate security vulnerability that can lead to significant risks if not addressed. It is crucial to update to the latest patched version to ensure the security and integrity of applications relying on this library. Regular monitoring and vulnerability assessments are essential for maintaining software security.
See every vulnerability recorded for libgcrypt →
FAQ
libgcrypt is a cryptographic library that provides various algorithms for secure data encryption and decryption, commonly used in software applications.
CVE-2026-41989 refers to a specific vulnerability in libgcrypt that can lead to Denial of Service and buffer overflow attacks through crafted ECDH ciphertext.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. By uploading your manifest file, you can check for vulnerabilities without needing to access the code.
The risks include potential application crashes, unauthorized access to sensitive data, and the possibility of further exploitation by attackers.
While the best solution is to update to the patched version, you can temporarily restrict access to affected services and validate inputs to reduce risk.
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Recent vulnerabilities recorded for libgcrypt.
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