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Wireshark CVE-2026-15171

| EUVDEUVD-2026-42417 MEDIUM
NULL Pointer Dereference (CWE-476)
2026-07-08 cve@gitlab.com GHSA-gqgc-f2j4-fxx4
Denial Of Service Null Pointer Dereference Wireshark
5.5
CVSS 3.1 · Vendor: gitlab
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Severity by source

Vendor (gitlab) PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
vuln.today AI
5.5 MEDIUM

AV:L fits Wireshark as a desktop application triggered by file open; UI:R required; PR:N as no system auth needed; A:H for crash; no C or I impact.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (gitlab).

CVSS VectorVendor: gitlab

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

Lifecycle Timeline

2
Analysis Generated
Jul 08, 2026 - 22:15 vuln.today
Patch available
Jul 08, 2026 - 22:04 EUVD

DescriptionCVE.org

SSH protocol dissector crash in Wireshark 4.6.0 to 4.6.6 and 4.4.0 to 4.4.16 allows denial of service

AnalysisAI

Wireshark's SSH protocol dissector crashes via a null pointer dereference (CWE-476) in versions 4.4.0-4.4.16 and 4.6.0-4.6.6, enabling denial of service against any analyst or engineer running an affected build. The flaw is triggered locally when Wireshark processes malformed SSH protocol data, whether from a live capture or a crafted packet capture file, causing the application to crash and disrupting network analysis workflows. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malformed SSH packet capture file
Delivery
Deliver pcap to target analyst
Exploit
Analyst opens file in affected Wireshark
Execution
SSH dissector dereferences null pointer
Persist
Wireshark process crashes
Impact
Analysis workflow disrupted
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the victim is running Wireshark version 4.4.0-4.4.16 or 4.6.0-4.6.6 with the SSH protocol dissector enabled (enabled by default). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 base score of 5.5 (Medium) with vector AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H accurately reflects the constrained exploitation scenario. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker packages a specially crafted .pcap file containing malformed SSH protocol data designed to reach the null pointer dereference in Wireshark's SSH dissector, then delivers it to a security analyst via email, a ticketing system attachment, or a shared file repository under a plausible label such as 'suspicious_traffic_capture.pcapng'. When the analyst opens the file in an affected Wireshark version, the SSH dissector crashes the application, interrupting ongoing analysis. …
Remediation Upgrade to Wireshark 4.4.17 or 4.6.7, which contain the vendor-released patch for this vulnerability. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-476 – NULL Pointer Dereference

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CVE-2015-3194 HIGH
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CVE-2026-21525 MEDIUM
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Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
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CVE-2011-0611 HIGH POC
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CVE-2012-1889 HIGH POC
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CVE-2012-0507 CRITICAL POC
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CVE-2014-1761 HIGH POC
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CVE-2015-5122 CRITICAL POC
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CVE-2011-0609 HIGH POC
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CVE-2026-15171 vulnerability details – vuln.today
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