High severity · published Apr 30, 2026
CVE-2026-5402
Heap-based Buffer Overflow in Wireshark
8.8
CVSS
0.4%
EPSS
No
On KEV
Description
TLS protocol dissector heap overflow in Wireshark 4.6.0 to 4.6.4 allows denial of service and possible code execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 33% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WI
Wireshark · Wireshark Foundation
4.6.0 before 4.6.5 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5402
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5402
Exploit
https://gitlab.com/wireshark/wireshark/-/issues/21090
Vendor Advisory
https://www.wireshark.org/security/wnpa-sec-2026-14.html
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-5402
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2464038
security.access.redhat.com
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5402.json
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