Critical severity · published Aug 19, 2026
CVE-2026-76886
Heap-based Buffer Overflow in Wireshark
9.8
CVSS
0.4%
EPSS
No
On KEV
Description
C12.22 protocol dissector crash in 4.6.0 to 4.6.7 and 4.4.0 to 4.4.18 allows denial of service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% 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 4.6.8; 4.4.0 before 4.4.18 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-76886
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-76886
Exploit
https://gitlab.com/wireshark/wireshark/-/work_items/21439
Vendor Advisory
https://www.wireshark.org/security/wnpa-sec-2026-75.html
Exploit
https://gitlab.com/wireshark/wireshark/-/work_items/21446
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