rabbitmq-c: Heap buffer overflow in AMQP login handshake via undersized connection.tune.frame_max
Summary
| CVE | CVE-2026-44236 |
|---|---|
| State | PUBLISHED |
| Assigner | GitHub_M |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-17 18:16:44 UTC |
| Updated | 2026-09-24 15:02:58 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.1 7.1 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
EPSS: 0.004820000 probability, percentile 0.389150000 (date 2026-09-24)
Problem Types: CWE-122 | CWE-122 CWE-122: Heap-based Buffer Overflow
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 7.1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H |
| 3.1 | CNA | DECLARED | 7.1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
RequiredScope
UnchangedConfidentiality
NoneIntegrity
LowAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Alanxz | Rabbitmq-c | affected < 0.16.0 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5v | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | github.com | |
| github.com/alanxz/rabbitmq-c/pull/879 | [email protected] | github.com | |
| github.com/alanxz/rabbitmq-c/releases/tag/v0.16.0 | [email protected] | github.com | |
| github.com/alanxz/rabbitmq-c/commit/4777d0b5c58cb02966a04a85832436bd66ed... | [email protected] | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.