Moderate Security Update for Wireshark: Buffer Over-read and Memory Allocation Issues
Summary
ALSA-2026:9666: Moderate: wireshark security update. Affects wireshark versions < 1:4.4.2-4.el10_1.4. Fixed in 1:4.4.2-4.el10_1.4. How to fix ↓
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Background
Wireshark is a widely-used network protocol analyzer that allows users to capture and interactively browse the traffic running on a computer network. It is essential for network troubleshooting, analysis, software and communications protocol development, and education. The tool provides a rich feature set, including deep inspection of hundreds of protocols, live capture, and offline analysis. However, it has recently been found to have vulnerabilities that could potentially compromise its functionality and the security of the systems it operates on.
Vulnerability Detail
The vulnerabilities identified in Wireshark include a buffer over-read (CVE-2026-3203) and improperly controlled sequential memory allocation (CVE-2026-3201). The buffer over-read can lead to the exposure of sensitive information, while the memory allocation issue may allow an attacker to exploit the system's memory management, potentially leading to arbitrary code execution. These vulnerabilities arise from flaws in the way Wireshark processes certain network protocols, making it critical for users to address them promptly.
How To Fix
Minimum fixed version
1:4.4.2-4.el10_1.4
This is the first release that contains the fix.
sudo dnf update wiresharkTip — 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 exposure of Wireshark to untrusted networks or avoid using it to analyze potentially malicious traffic until the update is applied. Additionally, users should ensure that their systems are configured to limit the permissions of the Wireshark application.
Conclusion
In summary, the recent vulnerabilities found in Wireshark pose significant risks to users, including potential data exposure and system exploitation. It is crucial for users to update their installations to the latest patched version to mitigate these risks. Utilizing tools like Vulert can help monitor for such vulnerabilities in real-time.
See every vulnerability recorded for wireshark →
FAQ
Wireshark is a network protocol analyzer that captures and displays the data traveling over a network in real-time.
The vulnerabilities include a buffer over-read (CVE-2026-3203) and improperly controlled sequential memory allocation (CVE-2026-3201).
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Visit Vulert Scanner to check your application without needing to sign up.
As a workaround, limit the use of Wireshark to trusted networks and avoid analyzing suspicious traffic until you can apply the update.
For more details, refer to the CVE pages for CVE-2026-3203 and CVE-2026-3201, which provide in-depth information about the vulnerabilities.
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