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Wireshark CVE-2026-5402

| EUVDEUVD-2026-26318 HIGH
Heap-based Buffer Overflow (CWE-122)
2026-04-30 GitLab
Denial Of Service Buffer Overflow RCE Heap Overflow Wireshark
8.8
CVSS 3.1 · Vendor: GitLab
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Severity by source

Vendor (GitLab) PRIMARY
8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
8.8 HIGH
qualitative

Primary rating from Vendor (GitLab).

CVSS VectorVendor: GitLab

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

8
Patch released
May 01, 2026 - 19:26 nvd
Patch available
Patch available
Apr 30, 2026 - 08:16 EUVD
Analysis Updated
Apr 30, 2026 - 07:27 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 30, 2026 - 07:22 vuln.today
cvss_changed
Analysis Generated
Apr 30, 2026 - 06:46 vuln.today
EUVD ID Assigned
Apr 30, 2026 - 06:30 euvd
EUVD-2026-26318
Analysis Generated
Apr 30, 2026 - 06:30 vuln.today
CVE Published
Apr 30, 2026 - 05:39 nvd
HIGH 8.8

DescriptionCVE.org

TLS protocol dissector heap overflow in Wireshark 4.6.0 to 4.6.4 allows denial of service and possible code execution

AnalysisAI

Heap overflow in Wireshark 4.6.0 through 4.6.4 TLS protocol dissector enables remote code execution when a user opens a malicious capture file or inspects crafted network traffic. The vulnerability requires user interaction (UI:R) but no authentication, making it exploitable via social engineering. No public exploit code identified at time of analysis, though the technical details are disclosed in vendor advisory wnpa-sec-2026-14 and tracked in GitLab issue #21090. CVSS 8.8 reflects the combination of network vector, low complexity, and potential for complete system compromise despite the user interaction requirement.

Technical ContextAI

This vulnerability affects the TLS protocol dissector component in Wireshark, the widely-used network protocol analyzer. A dissector is the code responsible for parsing and interpreting specific network protocols from captured traffic. The CWE-122 classification indicates a heap-based buffer overflow, where the TLS dissector writes beyond allocated memory boundaries during parsing of malformed or specially crafted TLS protocol data. Heap overflows are particularly dangerous because they can corrupt adjacent memory structures, potentially allowing attackers to hijack program control flow. The affected versions span Wireshark 4.6.0 through 4.6.4, representing the entire 4.6.x release series to date. The CPE string cpe:2.3:a:wireshark_foundation:wireshark identifies this as an application-level vulnerability in software maintained by the Wireshark Foundation.

RemediationAI

Upgrade to Wireshark version 4.6.5 or later, which contains fixes for the TLS dissector heap overflow per security advisory wnpa-sec-2026-14 available at https://www.wireshark.org/security/wnpa-sec-2026-14.html. Organizations should prioritize patching systems used by security analysts, network engineers, and incident responders who routinely analyze packet captures from untrusted sources. If immediate patching is not feasible, implement defense-in-depth controls: disable the TLS dissector via Analyze > Enabled Protocols menu (eliminates attack surface but prevents TLS traffic analysis), restrict Wireshark usage to analysis of captures from trusted internal sources only (reduces social engineering exposure), and deploy Wireshark in sandboxed or virtualized environments with limited network access (contains potential compromise). The dissector disable workaround significantly impacts functionality for SSL/TLS troubleshooting workflows. Long-term, establish processes for reviewing security advisories at https://www.wireshark.org/security/ and schedule regular Wireshark updates, as protocol dissector vulnerabilities represent an ongoing attack surface in network analysis tools.

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Same weakness CWE-122 – Heap-based Buffer Overflow

View all
CVE-2023-4911 HIGH POC
7.8
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7.8
CVE-2025-24993 HIGH
7.8
CVE-2023-6246 HIGH POC
8.4
CVE-2026-42945 CRITICAL POC
9.2
CVE-2014-0781 CRITICAL POC
9.3
CVE-2024-30085 HIGH POC
7.8

Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed

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CVE-2026-5402 vulnerability details – vuln.today
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