CVE-2026-5402 Details
Description
TLS protocol dissector heap overflow in Wireshark 4.6.0 to 4.6.4 allows denial of service and possible code execution
A heap-based buffer overflow vulnerability has been identified in the TLS protocol dissector of Wireshark versions 4.6.0 to 4.6.4. This vulnerability allows for a denial-of-service condition and potentially enables the execution of untrusted code. The issue arises from an integer truncation in the processing of Encrypted Client Hello (ECH) extensions, which can be exploited by injecting a malformed packet or by convincing a user to open a compromised packet trace file.
Users are advised to upgrade to Wireshark version 4.6.5 or later.
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 May 1, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-5402 | redhat-SADP | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2464038 | redhat-SADP | |
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5402.json | redhat-SADP | |
| https://gitlab.com/wireshark/wireshark/-/issues/21090 | [email protected] | ExploitIssue Tracking |
| https://www.wireshark.org/security/wnpa-sec-2026-14.html | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-122 | Heap-based Buffer Overflow | redhat-SADP |
| CWE-122 | Heap-based Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| wireshark wireshark | >= 4.6.0, <= 4.6.4 |
CPE
Remediation
| |
Change History
8 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 1, 2026 | Initial Analysis | [email protected] |
| May 1, 2026 | CVE Modified | CISA-ADP |
| Apr 30, 2026 | CVE Modified | CISA-ADP |
| Apr 30, 2026 | New CVE Received | [email protected] |