CVE-2026-67238

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Source
https://cve.org/CVERecord?id=CVE-2026-67238
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67238.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-67238
Aliases
  • GHSA-x96j-244m-mrr2
Downstream
Published
2026-09-23T19:58:35Z
Modified
2026-09-25T03:48:37Z
Severity
  • 7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
RabbitMQ: Atom-table exhaustion via reply-to queue name decoding
Details

RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, rabbit_pid_codec:decompose_from_binary/1 parses a caller-supplied ETF-encoded binary and calls binary_to_atom(Node, utf8) on the node-name field. It is reached from rabbit_volatile_queue:pid_from_name/2, which is invoked for any queue name / routing key beginning amq.rabbitmq.reply-to.. The CandidateNodes membership check happens after the atom is created, and the surrounding try/catch cannot reclaim atoms (they are never GC'd). binary_to_existing_atom is not used. Any authenticated AMQP client can crash the entire Erlang VM (all vhosts, all connections) with ~1M cheap requests. Preconditions include Authenticated AMQP 0-9-1 connection to any vhost No per-connection rate limit low enough to make ~1M operations infeasible. This issue is fixed in versions 4.2.7 and 4.3.1.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-400"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67238.json"
}
References

Affected packages

Git / github.com/rabbitmq/rabbitmq-server

Affected ranges

Type
GIT
Repo
https://github.com/rabbitmq/rabbitmq-server
Events
Introduced
95c501fbad76c66156346cf364d158d6e30aa4d9
Introduced
1929eeadf9b2bac12c5434fb56884ef27370580e
Fixed
b15fd2a3e5465cb6ed403d5a774ef61b1a391b89
Fixed
49decca35e59d2cb774e5abd76412cee721308a5
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "4.2.0"
        },
        {
            "fixed":  "4.2.7"
        },
        {
            "introduced":  "4.3.0"
        },
        {
            "fixed":  "4.3.1"
        }
    ],
    "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
v4.3.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67238.json"