CVE-2026-6520 Details
Description
OpenFlow v6 protocol dissector infinite loop in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service
A denial-of-service vulnerability has been identified in the OpenFlow v6 protocol dissector of Wireshark. This issue, present in Wireshark versions 4.6.0 through 4.6.4 and 4.4.0 through 4.4.14, arises from a bundle property underflow that leads to an infinite loop. The problem occurs when the property length is less than four, causing an unsigned subtraction that wraps and prevents the loop from terminating. As a result, Wireshark can be made to consume excessive CPU resources.
Users can upgrade to Wireshark versions 4.6.5, 4.4.15 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 30, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://gitlab.com/wireshark/wireshark/-/work_items/21181 | [email protected] | ExploitIssue TrackingThird Party Advisory |
| https://www.wireshark.org/security/wnpa-sec-2026-40.html | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-835 | Loop with Unreachable Exit Condition ('Infinite Loop') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| wireshark wireshark | >= 4.4.0, <= 4.4.14 >= 4.6.0, <= 4.6.4 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 1, 2026 | Initial Analysis | [email protected] |
| Apr 30, 2026 | New CVE Received | [email protected] |