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Vulnerability Details :

CVE-2026-30867

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-02 Apr, 2026 | 13:57
Updated At-02 Apr, 2026 | 16:23
Rejected At-
Credits

CocoaMQTT: Denial of Service via Reachable Assertion in `PUBLISH` Packet Parsing

CocoaMQTT is a MQTT 5.0 client library for iOS and macOS written in Swift. Prior to version 2.2.2, a vulnerability exists in the packet parsing logic of CocoaMQTT that allows an attacker (or a compromised/malicious MQTT broker) to remotely crash the host iOS/macOS/tvOS application. If an attacker publishes the 4-byte malformed payload to a shared topic with the RETAIN flag set to true, the MQTT broker will persist the payload. Any time a vulnerable client connects and subscribes to that topic, the broker will automatically push the malformed packet. The app will instantly crash in the background before the user can even interact with it. This effectively "bricks" the mobile application (a persistent DoS) until the retained message is manually wiped from the broker database. This issue has been patched in version 2.2.2.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:02 Apr, 2026 | 13:57
Updated At:02 Apr, 2026 | 16:23
Rejected At:
â–¼CVE Numbering Authority (CNA)
CocoaMQTT: Denial of Service via Reachable Assertion in `PUBLISH` Packet Parsing

CocoaMQTT is a MQTT 5.0 client library for iOS and macOS written in Swift. Prior to version 2.2.2, a vulnerability exists in the packet parsing logic of CocoaMQTT that allows an attacker (or a compromised/malicious MQTT broker) to remotely crash the host iOS/macOS/tvOS application. If an attacker publishes the 4-byte malformed payload to a shared topic with the RETAIN flag set to true, the MQTT broker will persist the payload. Any time a vulnerable client connects and subscribes to that topic, the broker will automatically push the malformed packet. The app will instantly crash in the background before the user can even interact with it. This effectively "bricks" the mobile application (a persistent DoS) until the retained message is manually wiped from the broker database. This issue has been patched in version 2.2.2.

Affected Products
Vendor
emqx
Product
CocoaMQTT
Versions
Affected
  • < 2.2.2
Problem Types
TypeCWE IDDescription
CWECWE-617CWE-617: Reachable Assertion
Type: CWE
CWE ID: CWE-617
Description: CWE-617: Reachable Assertion
Metrics
VersionBase scoreBase severityVector
3.15.7MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Version: 3.1
Base score: 5.7
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/emqx/CocoaMQTT/security/advisories/GHSA-r3fr-7m74-q7g2
x_refsource_CONFIRM
https://github.com/emqx/CocoaMQTT/pull/659
x_refsource_MISC
https://github.com/emqx/CocoaMQTT/commit/010bca6f61b97d726252f61641d331a2bf82b338
x_refsource_MISC
https://github.com/emqx/CocoaMQTT/releases/tag/2.2.2
x_refsource_MISC
Hyperlink: https://github.com/emqx/CocoaMQTT/security/advisories/GHSA-r3fr-7m74-q7g2
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/emqx/CocoaMQTT/pull/659
Resource:
x_refsource_MISC
Hyperlink: https://github.com/emqx/CocoaMQTT/commit/010bca6f61b97d726252f61641d331a2bf82b338
Resource:
x_refsource_MISC
Hyperlink: https://github.com/emqx/CocoaMQTT/releases/tag/2.2.2
Resource:
x_refsource_MISC
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:02 Apr, 2026 | 14:16
Updated At:07 Apr, 2026 | 18:04

CocoaMQTT is a MQTT 5.0 client library for iOS and macOS written in Swift. Prior to version 2.2.2, a vulnerability exists in the packet parsing logic of CocoaMQTT that allows an attacker (or a compromised/malicious MQTT broker) to remotely crash the host iOS/macOS/tvOS application. If an attacker publishes the 4-byte malformed payload to a shared topic with the RETAIN flag set to true, the MQTT broker will persist the payload. Any time a vulnerable client connects and subscribes to that topic, the broker will automatically push the malformed packet. The app will instantly crash in the background before the user can even interact with it. This effectively "bricks" the mobile application (a persistent DoS) until the retained message is manually wiped from the broker database. This issue has been patched in version 2.2.2.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.15.7MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Primary3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Type: Secondary
Version: 3.1
Base score: 5.7
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Type: Primary
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CPE Matches

emqx
emqx
>>cocoamqtt>>Versions before 2.2.2(exclusive)
cpe:2.3:a:emqx:cocoamqtt:*:*:*:*:*:swift:*:*
Apple Inc.
apple
>>iphone_os>>-
cpe:2.3:o:apple:iphone_os:-:*:*:*:*:*:*:*
Apple Inc.
apple
>>macos>>-
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-617Primarysecurity-advisories@github.com
CWE ID: CWE-617
Type: Primary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/emqx/CocoaMQTT/commit/010bca6f61b97d726252f61641d331a2bf82b338security-advisories@github.com
Patch
https://github.com/emqx/CocoaMQTT/pull/659security-advisories@github.com
Issue Tracking
Patch
https://github.com/emqx/CocoaMQTT/releases/tag/2.2.2security-advisories@github.com
Release Notes
https://github.com/emqx/CocoaMQTT/security/advisories/GHSA-r3fr-7m74-q7g2security-advisories@github.com
Exploit
Vendor Advisory
Hyperlink: https://github.com/emqx/CocoaMQTT/commit/010bca6f61b97d726252f61641d331a2bf82b338
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/emqx/CocoaMQTT/pull/659
Source: security-advisories@github.com
Resource:
Issue Tracking
Patch
Hyperlink: https://github.com/emqx/CocoaMQTT/releases/tag/2.2.2
Source: security-advisories@github.com
Resource:
Release Notes
Hyperlink: https://github.com/emqx/CocoaMQTT/security/advisories/GHSA-r3fr-7m74-q7g2
Source: security-advisories@github.com
Resource:
Exploit
Vendor Advisory

Change History

0
Information is not available yet

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