Wireshark up to 4.4.14/4.6.4 SMB2 Protocol Dissector improperly controlled sequential memory allocation

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Wireshark up to 4.4.14/4.6.4. This issue affects some unknown processing of the component SMB2 Protocol Dissector. The manipulation leads to improperly controlled sequential memory allocation. This vulnerability is uniquely identified as CVE-2026-6867. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Wireshark up to 4.4.14/4.6.4. It has been rated as problematic. This issue affects an unknown code of the component SMB2 Protocol Dissector. The manipulation with an unknown input leads to a improperly controlled sequential memory allocation vulnerability. Using CWE to declare the problem leads to CWE-1325. The product manages a group of objects or resources and performs a separate memory allocation for each object, but it does not properly limit the total amount of memory that is consumed by all of the combined objects. Impacted is availability. The summary by CVE is:

SMB2 protocol dissector crash in Wireshark 4.6.0 to 4.6.4 and 4.4.0 to 4.4.14 allows denial of service

The weakness was disclosed by TODO. It is possible to read the advisory at wireshark.org. The identification of this vulnerability is CVE-2026-6867 since 04/22/2026. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 327387 (Amazon Linux 2023 : wireshark-cli, wireshark-devel (ALAS2023-2026-1904)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.4.15 or 4.6.5 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (327387). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.2

VulDB Base Score: 3.1
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.5
CNA Vector (GitLab): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improperly controlled sequential memory allocation
CWE: CWE-1325
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 327387
Nessus Name: Amazon Linux 2023 : wireshark-cli, wireshark-devel (ALAS2023-2026-1904)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Wireshark 4.4.15/4.6.5

Timelineinfo

04/22/2026 CVE reserved
04/30/2026 +8 days Advisory disclosed
04/30/2026 +0 days VulDB entry created
07/18/2026 +79 days VulDB entry last update

Sourcesinfo

Product: wireshark.org

Advisory: wireshark.org
Researcher: TODO
Status: Confirmed

CVE: CVE-2026-6867 (🔒)
GCVE (CVE): GCVE-0-2026-6867
GCVE (VulDB): GCVE-100-360287

Entryinfo

Created: 04/30/2026 12:29
Updated: 07/18/2026 10:20
Changes: 04/30/2026 12:29 (64), 07/18/2026 10:20 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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