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Wireshark EUVDEUVD-2026-88706

| CVE-2026-95392 MEDIUM
Buffer Over-read (CWE-126)
2026-09-29 GitLab GHSA-ww33-r9xr-r55j
Buffer Overflow Denial Of Service 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 MBIM capture file
  2. Delivery
    Deliver to analyst (share/inject frame)
  3. Exploit
    Analyst opens capture in Wireshark
  4. Execution
    MBIM dissector reads out of bounds
  5. Impact
    Process crashes (denial of service)

Vulnerability Assessment

Weakness
CWE
CWE-126
ASVS 5.0
V15 - Secure Coding and Architecture Buffer over-read prevention
Exploitation Conditions

Exploitation requires a user to open or process a crafted packet capture (or a live/injected frame) that reaches Wireshark's MBIM (Mobile Broadband Interface Model, USB/cellular WWAN) protocol dissector in a vulnerable build (4.6.0-4.6.8 or 4.4.0-4.4.18). The MBIM dissector must actually be invoked on the malicious data. Limiting factors: attack vector is local (AV:L) and mandatory user interaction (UI:R) - there is no remote unauthenticated service exposure; impact is confined to a recoverable crash of the analysis tool with no confidentiality or integrity effect.
Impact

This is a low-priority, availability-only defect despite its 'medium' 5.5 rating. The CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H) is internally consistent with the description: a crash in the MBIM protocol dissector reachable only when a local analyst opens or replays a crafted capture. There is no confidentiality or integrity impact (C:N/I:N) - the sole consequence is a crash of the Wireshark/TShark process (A:H). No EPSS score, no CISA KEV listing, and no public POC are present in the input, so exploitation status is 'no public exploit identified at time of analysis.' The AV:L + UI:R combination is the critical de-rating signal: this is not remotely triggerable against a service; an attacker must get an analyst to load malicious input. Wireshark's own dissector-crash advisories are historically abundant and rarely exploited beyond crashing the tool. Net: real but minor - a recoverable local DoS in a widely deployed tool, not a network-facing priority. No conflicting signals in the data; the score and vector agree.
Exploit ScenarioDerived

An attacker crafts a packet capture containing malformed MBIM (Mobile Broadband Interface Model) protocol data, or injects such a frame onto a monitored interface, then lures an analyst into opening it in a vulnerable Wireshark/TShark build (4.6.0-4.6.8 or 4.4.0-4.4.18). When the MBIM dissector parses the malformed field it reads out of bounds and crashes the process, ending the analysis session. No public exploit code is identified at time of analysis, and only the tool crashes - no code execution or data disclosure.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 29, 2026

Denial of service in Wireshark 4.6.0 through 4.6.8 and 4.4.0 through 4.4.18 allows an attacker to crash the application by supplying a crafted packet capture or frame that reaches the MBIM (Mobile Broadband Interface Model) protocol dissector. The CVSS 3.1 vector (AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H, 5.5) shows the attack is local with no privileges required but requires user interaction - typically opening a malicious capture file - and the only impact is availability loss from a recoverable crash with no confidentiality or integrity effect. There is no public exploit identified at time of analysis and no confirmed actively exploited (CISA KEV) status; consistent with the independent assessment, this is a low-priority, availability-only defect despite its medium 5.5 rating, and consumers of untrusted captures should still patch or restrict the MBIM dissector.

RemediationAI

Primary remediation is to upgrade Wireshark past the affected ranges: move off 4.6.0-4.6.8 and 4.4.0-4.4.18 to the current fixed release for the relevant branch, with the exact patched version numbers specified in the vendor advisory https://www.wireshark.org/security/wnpa-sec-2026-100.html (no exact fix version was supplied in the available intelligence, so confirm it there before upgrading). Where prompt upgrading is not possible, the most direct compensating control is to disable the MBIM dissector in Analyze → Enabled Protocols (or via the -o 'mbim.enable: FALSE' preference for tshark), which removes the vulnerable parsing path - the trade-off being that MBIM/USB WWAN captures can no longer be decoded and will appear as raw or unparsed data. Additional practical measures with their own trade-offs: avoid opening packet captures from untrusted sources or use an isolated/containerized analysis environment, since ui interaction (opening the file) is the trigger and no remote exposure exists; restrict live capture on MBIM/WWAN interfaces to trusted hardware; and avoid running Wireshark with elevated privileges, as a crash of a privileged instance can disrupt the host session even though no privilege escalation or code execution is possible. Because the vulnerability is availability-only and recoverable, the operational risk of delaying the upgrade is generally limited to analyst workflow interruption, making the dissector-disable workaround acceptable as a short-term measure on systems that must ingest untrusted captures.

Affected VersionsENISA

Wireshark 4.6.0 <4.6.9
Wireshark 4.4.0 <4.4.19

Affected Packages

euvd wireshark fix: 4.4.19, 4.6.9

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Technical ContextAI · show details

The issue lives in Wireshark's packet dissection framework, which parses captured frames from a testy buffer (tvb) using per-protocol dissectors registered by the protocol tree. The affected component is the MBIM dissector, which decodes Mobile Broadband Interface Model traffic - the USB/cellular WWAN control protocol used between a host and a modem (MBIM is the successor to the older QMI/AT-based control channels). The root cause class is CWE-126 (Buffer Over-read): the dissector reads beyond the bounds of the captured buffer while parsing malformed MBIM attribute or payload structures, and the resulting memory fault terminates the Wireshark process. Because the malformed data is merely parsed for display, there is no write primitive and no code-execution path, which matches the assessed vector's C:N/I:N/A:H - a pure availability defect. The CPE record (cpe:2.3:a:wireshark_foundation:wireshark) confirms the affected product is Wireshark from the Wireshark Foundation, and the linked GitLab work items (21549, 21550) plus the vendor advisory wnpa-sec-2026-100 document the defect reports and the vendor's handling.

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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

Local file/frame parsing requires the analyst to open crafted input (AV:L/UI:R); no auth to run the tool (PR:N); crash-only, so C:N/I:N/A:H.

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 - 09:32 cve.org
MEDIUM 5.5

DescriptionCVE.org

MBIM protocol dissector crash in 4.6.0 to 4.6.8 and 4.4.0 to 4.4.18 allows denial of service

Threat Intelligence Overview

EPSS Score
0.2%
Top 96% exploitable
Prevalence
Ubiquitous
Wireshark is the de facto standard packet analyzer among network/security practitioners
Data Quality
6 sources
Confidence: High
EUVD 🇯🇵JVN NVD CVE.org EPSS Vulnrichment Vendor VulDB

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 0.2%
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
Poc
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

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

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-126 – Buffer Over-read

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CVE-2022-1907 HIGH POC
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Same technique Buffer Overflow

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CVE-2015-5119 CRITICAL POC
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CVE-2011-2462 CRITICAL POC
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CVE-2020-0796 CRITICAL POC
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CVE-2019-11043 CRITICAL POC
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CVE-2009-0927 HIGH POC
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CVE-2012-1889 HIGH POC
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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-2026-95392 ADVISORY https://vuldb.com/vuln/411262 REF https://gitlab.com/wireshark/wireshark/-/work_items/21549 REF https://gitlab.com/wireshark/wireshark/-/work_items/21550 REF https://www.wireshark.org/security/wnpa-sec-2026-100.html

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