CVE-2026-6536Public exploit

Analysis hang via zero-element compact array

Published Apr 30, 2026 · Updated Apr 30, 2026

Denial of service in Wireshark 4.6.0 through 4.6.4 allows attackers to hang packet analysis via crafted DLMS/COSEM data. A zero-element structure in dlms_dissect_compact_array_content leaves the content offset unchanged while its caller continues looping. Opening a crafted capture or dissecting one UDP packet on default port 4059 consumes one CPU core until the Wireshark or TShark process is killed.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Wireshark 4.6.0 through 4.6.4 allows attackers to hang packet analysis via crafted DLMS/COSEM data. A zero-element structure in dlms_dissect_compact_array_content leaves the content offset unchanged while its caller continues looping. Opening a crafted capture or dissecting one UDP packet on default port 4059 consumes one CPU core until the Wireshark or TShark process is killed.

The record

CVE
CVE-2026-6536
Published
Apr 30, 2026
Updated
Apr 30, 2026
Vendor
Wireshark Foundation
Product
Wireshark
Classifications
CWE-835, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.6.0 <4.6.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Wireshark Foundation · Wiresharkversion=4.6.0 <4.6.5

Published CVSS scores

5.5GitLab Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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