CVE-2026-0961 is a medium-severity vulnerability identified in Wireshark, a widely used network protocol analyzer. This vulnerability allows for denial of service due to a crash in the BLF file parser. The affected versions include Wireshark versions 4.6.0 through 4.6.2 and 4.4.0 through 4.4.12. With a CVSS score of 5.5, it presents a risk that organizations must take seriously.
The crash occurs when the application attempts to process a malicious BLF file, potentially leading to service interruptions. As organizations rely on Wireshark for network analysis and troubleshooting, any disruption could impact operations significantly. Therefore, it is crucial for security teams to prioritize remediation.
At this time, there are no known exploits for this vulnerability, but organizations should not wait for an exploit to surface. Waiting may lead to increased risk as attackers could develop ways to exploit this vulnerability. Organizations should prioritize patching immediately to protect their networks.
Mitigating this vulnerability involves updating to the latest version of Wireshark. Organizations should also monitor their systems for any unusual behavior that may indicate attempts to exploit this vulnerability.
Vulnerability Details
The official description of this vulnerability notes that it arises from a crash in the BLF file parser of Wireshark versions 4.6.0 to 4.6.2 and 4.4.0 to 4.4.12. The vulnerability is classified under CWE-787 (Out-of-bounds Write), which indicates a potential for denial of service. The CVSS score is assessed at 5.5, indicating a medium severity.
Technical Analysis
The root cause of the vulnerability is a failure to properly handle certain BLF file inputs, allowing an attacker to trigger a crash. The attack vector is local; however, user interaction is required to open the malicious BLF file. The attack complexity is low, meaning that an attacker can easily exploit this vulnerability if a user inadvertently opens a crafted file.
Risk & Impact Analysis
Organizations that deploy Wireshark in their environments face risks associated with the potential denial of service caused by this vulnerability. If exploited, it could result in substantial disruptions to network analysis and management tasks, impacting productivity and operational efficiency. Given the CVSS score of 5.5, organizations should assess this vulnerability with a medium urgency level, scheduling remediation in their priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects Wireshark versions 4.6.0 to 4.6.2 and 4.4.0 to 4.4.12. Organizations using these versions should upgrade to the latest release to mitigate the risk.
Mitigation & Remediation
To address this vulnerability, organizations should update to the latest versions of Wireshark. If a patch is unavailable, consider implementing configuration hardening measures and conducting network controls to monitor for unusual file processing. For more comprehensive security testing, organizations might engage in penetration testing to identify vulnerabilities in their systems.
Detection Guidance
Organizations should monitor logs for error messages related to BLF file processing and be alert for any behavioral anomalies when opening BLF files. Furthermore, network signatures that indicate the use of known vulnerable versions should be established.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-0961 lies in its representation of the increasing complexity of file parsers and the implications of software dependencies in security. As organizations integrate tools like Wireshark into their ecosystems, understanding the vulnerabilities that arise from third-party components is crucial.
This vulnerability highlights the importance of maintaining an updated security posture and regularly assessing software dependencies. For deeper insights, organizations can refer to penetration testing methodology and the value of vulnerability management programs in defending against similar threats.
In conclusion, organizations must recognize the risks posed by vulnerabilities like CVE-2026-0961 and take proactive steps to mitigate their impact.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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