CVE-2026-44236

rabbitmq-c is a C-language AMQP client library for RabbitMQ. Prior to 0.16.0, a malicious AMQP server can send an undersized connection.tune.frame_max value during amqp_login(), and rabbitmq-c accepts the value in amqp_login_inner() in librabbitmq/amqp_socket.c. amqp_tune_connection() in librabbitmq/amqp_connection.c uses frame_max to reallocate the outbound buffer without enforcing AMQP_FRAME_MIN_SIZE. Immediate serialization of connection.tune-ok through amqp_frame_to_bytes() writes beyond the undersized heap allocation, causing memory corruption and likely denial of service. An on-path attacker can also trigger the flaw against plaintext AMQP traffic. Code execution is theoretically possible but was not demonstrated. This issue is fixed in version 0.16.0.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-122"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44236.json"
}

References

Affected packages

Git / github.com/alanxz/rabbitmq-c

Affected ranges

Type

GIT

Repo

https://github.com/alanxz/rabbitmq-c

Events

Introduced

Fixed

4777d0b5c58cb02966a04a85832436bd66ed5d1f

Fixed

800d57c9ca7352181167ec3c6aba66b8518c321c

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "0.16.0"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

0.*

0.2

librabbitmq-0.*

librabbitmq-0.1-amqp_0_8

rabbitmq-c-v0.*

rabbitmq-c-v0.3.0

v0.*

v0.1

v0.10.0

v0.11.0

v0.12.0

v0.13.0

v0.14.0

v0.15.0

v0.2

v0.3.0

v0.4.0

v0.4.0-test

v0.5.0

v0.5.1

v0.5.2

v0.6.0

v0.7.0

v0.7.1

v0.8.0

v0.9.0-master

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-44236.json"

vanir_signatures

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vanir_signatures_modified

"2026-09-19T08:35:41Z"