Denial of Service Vulnerability in Wireshark by The Wireshark Foundation
CVE-2026-5407

5.5MEDIUM

Key Information:

Vendor

Wireshark
Status
Wireshark
Vendor
CVE Published:
30 April 2026

What is CVE-2026-5407?

The SMB2 protocol dissector in Wireshark versions 4.6.0 through 4.6.4 and 4.4.0 through 4.4.14 is affected by a vulnerability that can lead to an infinite loop. This flaw can be exploited to create a denial of service condition, potentially disrupting network analysis functionality. Users running these versions are urged to apply necessary updates to mitigate the risk. For further details and guidance, refer to the official Wireshark security advisory.

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-2026-11.html
https://gitlab.com/wireshark/wireshark/-/issues/21073
issue-trackingpermissions-required

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

Brendan Coles
.