CVE-2026-67226

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Source
https://cve.org/CVERecord?id=CVE-2026-67226
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67226.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-67226
Aliases
  • GHSA-34c7-r8w9-5wv8
Downstream
Published
2026-09-25T16:29:13Z
Modified
2026-09-27T03:47:36Z
Severity
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
RabbitMQ: Admin-only atom exhaustion: PUT /api/users tags list
Details

RabbitMQ is a messaging and streaming broker. From 4.0.0 until 4.0.22 and 4.1.14 and 4.2.7, Admin-only atom exhaustion: PUT /api/users tags list. settags/2 maps rabbitdatacoercion:toatom/1 over the user's tags list. The 20 MB management body limit fits ~3-4M short tag strings. An administrator can crash the node in a single request by creating a user (or importing definitions) with ~1M unique tag administrator. This issue is fixed in versions 4.0.22 and 4.1.14 and 4.2.7.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-400"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67226.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "introduced":  "4.0.0"
                },
                {
                    "fixed":  "4.0.22"
                },
                {
                    "introduced":  "4.1.0"
                },
                {
                    "fixed":  "4.1.14"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/rabbitmq/rabbitmq-server

Affected ranges

Type
GIT
Repo
https://github.com/rabbitmq/rabbitmq-server
Events
Introduced
95c501fbad76c66156346cf364d158d6e30aa4d9
Fixed
86601c5a6d1c7e41060e3dbd165c88bdc91266ee
Fixed
b15fd2a3e5465cb6ed403d5a774ef61b1a391b89
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "4.2.0"
        },
        {
            "fixed":  "4.2.7"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v4.*
v4.2.0
v4.2.1
v4.2.2
v4.2.3
v4.2.4
v4.2.5
v4.2.6

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67226.json"