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Wireshark EUVDEUVD-2026-88685

| CVE-2026-95391 MEDIUM
Use After Free (CWE-416)
2026-09-29 GitLab GHSA-4w5v-7gfx-jwv5
Denial Of Service Use After Free Memory Corruption Red Hat Wireshark Suse Wireshark Foundation
5.5
CVSS 3.1 · Vendor: GitLab
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Craft malformed ZigBee ZCL packet
  2. Delivery
    Deliver via capture file or monitored link
  3. Exploit
    Analyst opens/dissects in Wireshark
  4. Execution
    Trigger use-after-free in ZCL dissector
  5. Impact
    Crash analyzer process (local DoS)

Vulnerability Assessment

Weakness
CWE
CWE-416
ASVS 5.0
V15 - Secure Coding and Architecture Memory lifecycle management
MITRE ATT&CK

2 techniques across 2 tactics: Execution, Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Exploitation Conditions

Requires the analyst to open a crafted capture file or live-dissect traffic containing a malformed ZigBee ZCL (ZigBee Cluster Library) packet in Wireshark 4.6.0 through 4.6.8. Exploitation is limited by: mandatory user interaction (UI:R - a human must load the packet/capture into Wireshark), a local attack vector (AV:L - no remote service is exposed; the analyzer must ingest the data), the requirement that ZigBee/ZCL traffic actually reach the dissector, and availability-only impact (a recoverable process crash with no code execution, data disclosure, or tampering).
Impact

All exploitation signals point to a low-priority, availability-only issue. The CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H) yields 5.5 (Medium) and is internally consistent with a use-after-free (CWE-416) in Wireshark's ZigBee ZCL dissector that crashes the analyzer process: local vector, user must open a crafted capture or feed a malicious ZCL packet, no confidentiality or integrity impact, and only availability is affected. No EPSS score, no CISA KEV listing, and no public proof-of-concept were provided, so there is no evidence of exploitation interest. This is a classic Wireshark dissector DoS: the crash is recoverable (restart the app), the trigger is narrow (ZigBee ZCL traffic decode), and impact is limited to the analyst's own workstation. Not a genuine priority despite the Medium score - treat as routine patch-on-schedule. No signals conflict; the main caveat is that the AV:L/UI:R vector correctly reflects that this is NOT remotely exploitable against a service, contrary to how 'protocol dissector' issues are sometimes misread.
Exploit ScenarioDerived

An attacker crafts a malformed ZigBee ZCL packet and either captures it into a file shared with an analyst or gets it onto a monitored segment; when the analyst opens the capture or live-dissects the traffic in Wireshark 4.6.0-4.6.8, the ZCL dissector triggers a use-after-free and crashes. Impact is limited to crashing the analyst's Wireshark session (denial of service). No public exploit code was identified at time of analysis.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 29, 2026

Denial of service in Wireshark 4.6.0 through 4.6.8: a use-after-free in the ZigBee ZCL (ZigBee Cluster Library) protocol dissector causes the application to crash when a malformed ZCL packet is dissected. The attack vector is local and requires user interaction - an analyst must open a crafted capture file or live-dissect malicious ZigBee traffic (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H, 5.5), and impact is limited to availability, with no code execution, data disclosure, or tampering reported. No public exploit code and no confirmed active exploitation were identified at time of analysis; exploitation is constrained by the need for the malformed packet to actually reach the ZigBee/ZCL dissector on a machine running an affected build.

RemediationAI

Primary fix: update Wireshark past the affected 4.6.0-4.6.8 range as directed by the vendor advisory https://www.wireshark.org/security/wnpa-sec-2026-92.html; the associated upstream change is merge request https://gitlab.com/wireshark/wireshark/-/merge_requests/26096, so upstream fix is available (PR/commit) but the corresponding released patched version is not independently confirmed from the supplied data - verify the fixed build number in the advisory before relying on it. If immediate upgrading is not possible, compensating controls with their trade-offs are: disable the ZigBee ZCL dissector (Analyze > Enabled Protocols, or launch with a disabled-protocols profile) so malformed ZCL frames are not parsed - this removes the crash path but also removes all ZigBee ZCL decode capability for legitimate troubleshooting; avoid opening untrusted or third-party packet captures and avoid running live ZigBee captures on production analyst workstations - this reduces exposure but does not fix the defect and is impractical for incident responders; restrict capture-file ingestion to vetted sources and use a dedicated, disposable analysis VM for hostile traffic - the crash then only terminates the throwaway guest and unsaved session data is still lost; and run Wireshark as a non-privileged user without capture privileges so that any crash stays confined to the analyst's user context. Because exploitation requires user interaction and yields only a process crash, patch deployment can be scheduled at normal priority rather than treated as an emergency.

Affected VersionsENISA

Wireshark 4.6.0 <4.6.9

Affected Packages

euvd wireshark fix: 4.6.9

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Technical ContextAI · show details

Wireshark is a widely deployed multi-protocol network protocol analyzer whose dissectors parse captured or live packet data. This issue is a CWE-416 use-after-free inside the ZigBee ZCL dissector: while decoding a malformed ZigBee Cluster Library frame, the dissector frees or discards a buffer (typically during reassembly, reassembly-key handling, or attribute/transaction parsing) and then reads from it again, dereferencing stale memory. The reported CVE CPE string (cpe:2.3:a:wireshark_foundation:wireshark:*:*:*:*:*:*:*:*) is version-wildcarded, so the authoritative version range comes from the Wireshark advisory and the description: 4.6.0 through 4.6.8. Because the flaw lives in the packet-decoding path rather than in a network service, no listening port or remote endpoint is exposed - the vulnerable code executes only when the user's Wireshark instance ingests and dissects the malformed ZigBee ZCL payload. The practical consequence of a use-after-free of this class in Wireshark is a recoverable process crash (aborted dissection session and loss of unsaved capture state) rather than memory corruption that yields arbitrary code execution, which is consistent with the availability-only assessed impact.

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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

Analyst must open a crafted capture (AV:L/UI:R), no privileges needed (PR:N); use-after-free crashes only the analyzer process, so availability-only (A:H) with no C/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:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE MEDIUM
Red Hat 5.5 MEDIUM

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
Patch available
Sep 29, 2026 - 11:01 EUVD
CVE Published
Sep 29, 2026 - 09:33 cve.org
MEDIUM 5.5

DescriptionCVE.org

ZigBee ZCL protocol dissector crash in 4.6.0 to 4.6.8 allows denial of service

Threat Intelligence Overview

EPSS Score
0.1%
Top 97% exploitable
Prevalence
Ubiquitous
Wireshark is the de facto standard open-source network protocol analyzer
Data Quality
5 sources
Confidence: Medium
EUVD 🇯🇵JVN NVD CVE.org EPSS Vulnrichment Vendor

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.1%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Small
Automatable
No
Human Impact· derived
High
Technical Impact
Partial

Priority Score

28
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +28
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Use After Free HIGH

Use-after-free vulnerabilities occur when a program continues to access memory through a pointer after that memory has been deallocated.

Memory Corruption HIGH

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

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Same weakness CWE-416 – Use After Free

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Same technique Denial Of Service

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CVE-2011-2462 CRITICAL 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-2011-0609 HIGH POC
7.8

Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 12 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected

References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-95391 REF https://gitlab.com/wireshark/wireshark/-/merge_requests/26096 REF https://www.wireshark.org/security/wnpa-sec-2026-92.html

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