Moderate Vulnerability in glibc Package: Denial of Service via iconv() Function
Summary
ALSA-2026:20594: Moderate: glibc security update. Affects glibc versions < 2.39-124.el10_2.alma.1. Fixed in 2.39-124.el10_2.alma.1. How to fix ↓
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Background
The glibc (GNU C Library) package is a core component of the Linux operating system, providing essential libraries for C programming, POSIX threading, and standard math operations. It is crucial for the functioning of various applications and system processes. The glibc package is widely used across different Linux distributions, including AlmaLinux, and is integral to system stability and performance.
Vulnerability Detail
The vulnerability identified as CVE-2026-4046 allows for a Denial of Service (DoS) attack through the iconv() function when specific character sets are used. This issue arises from improper handling of certain inputs, which can lead to resource exhaustion or crashes, thereby affecting the availability of services relying on glibc. Attackers can exploit this vulnerability to disrupt normal operations, making it critical for users to address it promptly.
How To Fix
Minimum fixed version
2.39-124.el10_2.alma.1
This is the first release that contains the fix.
sudo dnf update glibcTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary measure, users can limit the use of the iconv() function with untrusted input or avoid using specific character sets known to trigger the vulnerability until the package is updated.
Conclusion
The glibc vulnerability CVE-2026-4046 poses a significant risk of Denial of Service attacks through the iconv() function. It is essential for users to update their glibc package to the latest version to protect their systems from potential exploitation. Temporary workarounds can be employed until the update is applied.
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FAQ
CVE-2026-4046 is a vulnerability in the glibc package that allows for Denial of Service attacks via the iconv() function.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Exploiting this vulnerability can lead to service disruptions, making applications reliant on glibc unavailable to users.
Yes, a patched version of glibc (2.39-124.el10_2.alma.1) is available. Users should update to this version to mitigate the risk.
If immediate updates are not possible, consider implementing workarounds such as restricting the use of the iconv() function with untrusted input.
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