Denial of Service Vulnerability in Wireshark OpenFlow Protocol Dissector
CVE-2026-6521

5.5MEDIUM

Key Information:

Vendor

Wireshark
Status
Wireshark
Vendor
CVE Published:
30 April 2026

What is CVE-2026-6521?

The OpenFlow v5 protocol dissector in Wireshark versions 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 contains a vulnerability that can result in infinite loops, leading to a denial of service. Attackers exploiting this flaw can cause the application to hang or crash, significantly disrupting the user experience and potentially compromising network analysis capabilities. Users are encouraged to update their Wireshark version to the latest secure release to mitigate this issue.

Affected Version(s)

Wireshark 4.6.0 < 4.6.5

Wireshark 4.4.0 < 4.4.15

References

https://www.wireshark.org/security/wnpa-sec-2026-39.html
https://gitlab.com/wireshark/wireshark/-/work_items/21182
https://gitlab.com/wireshark/wireshark/-/work_items/21188

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sharon Brizinov
.