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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 Red Hat Suse
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
SUSE
MEDIUM
qualitative
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (gitlab).

CVSS VectorVendor: gitlab

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. No active exploitation has been confirmed in CISA KEV, and no public exploit code is known at time of analysis.

Technical ContextAI

Wireshark is the de facto standard open-source network protocol analyzer. Its dissector architecture parses hundreds of protocols, including SSH, by walking packet buffers and constructing protocol trees. CWE-476 (NULL Pointer Dereference) indicates the SSH dissector references a pointer that was never initialized or has been freed before performing a dereference operation on certain crafted SSH messages, causing a segmentation fault and process crash. The local attack vector (AV:L) is typical for Wireshark flaws: as a desktop GUI application, the primary exploitation path is through crafted .pcap/.pcapng files opened by a user rather than direct network exposure of the Wireshark process itself. Affected CPE ranges cover the 4.4.x and 4.6.x release trains as confirmed by the EUVD advisory EUVD-2026-42417.

RemediationAI

Upgrade to Wireshark 4.4.17 or 4.6.7, which contain the vendor-released patch for this vulnerability. Both fixed versions are identified from the EUVD affected-version data and the vendor advisory at https://www.wireshark.org/security/wnpa-sec-2026-55.html. If an immediate upgrade is not possible, a targeted workaround is to disable the SSH protocol dissector within Wireshark preferences (Analyze > Enabled Protocols, uncheck SSH); this prevents the vulnerable code path from executing but will also suppress SSH dissection for legitimate captures, requiring analysts to rely on raw hex views for SSH traffic. Additionally, restrict analysts to opening only trusted capture files from known-good sources, particularly when monitoring networks that include external or adversary-controlled hosts. No network-layer compensating control applies given the local attack vector.

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Same weakness CWE-476 – NULL Pointer Dereference

View all
CVE-2016-0742 HIGH
7.5
CVE-2014-3470 MEDIUM
4.3
CVE-2017-3730 HIGH POC
7.5
CVE-2017-3169 CRITICAL POC
9.8
CVE-2016-4957 HIGH
7.5
CVE-2015-3194 HIGH
7.5
CVE-2026-21525 MEDIUM
6.2
CVE-2017-0016 MEDIUM
5.9

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: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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CVE-2026-15171 vulnerability details – vuln.today
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