CVE-2025-13946

Analyzer hang via MEGACO dissector loop

Published Dec 3, 2025 · Updated Mar 27, 2026

Infinite looping in the MEGACO dissector in Wireshark 4.4.0 through 4.4.11 and 4.6.0 through 4.6.1 allows attackers to cause a hang. The vendor has not published which MEGACO parsing loop fails to advance or terminate on malformed input. The packet must be injected onto a monitored network or opened as a capture file; successful processing consumes excessive CPU and hangs the analyzer.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Infinite looping in the MEGACO dissector in Wireshark 4.4.0 through 4.4.11 and 4.6.0 through 4.6.1 allows attackers to cause a hang. The vendor has not published which MEGACO parsing loop fails to advance or terminate on malformed input. The packet must be injected onto a monitored network or opened as a capture file; successful processing consumes excessive CPU and hangs the analyzer.

The record

CVE
CVE-2025-13946
Published
Dec 3, 2025
Updated
Mar 27, 2026
Vendor
Wireshark Foundation
Product
Wireshark
Classifications
CWE-835, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 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=4.4.0 <4.4.11
  2. Affected versionversion=4.6.0 <4.6.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Wireshark Foundation · Wiresharkversion=4.4.0 <4.4.11; version=4.6.0 <4.6.1

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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