---
id: CVE-2026-44236
title: rabbitmq-c is a C-language AMQP client library for RabbitMQ
summary: >-
  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
  l…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H'
cwe:
  - CWE-122
  - CWE-131
vendor: alanxz
product: rabbitmq-c
affected:
  - rabbitmq-c < 0.16.0
published: '2026-09-17'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T15:02:58.307'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-44236'
references:
  - url: >-
      https://github.com/alanxz/rabbitmq-c/commit/4777d0b5c58cb02966a04a85832436bd66ed5d1f
    label: security-advisories@github.com
  - url: 'https://github.com/alanxz/rabbitmq-c/pull/879'
    label: security-advisories@github.com
  - url: 'https://github.com/alanxz/rabbitmq-c/releases/tag/v0.16.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5v
    label: security-advisories@github.com
  - url: >-
      https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5v
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44236.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-44236'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2536500'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-44236'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-44236'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
epss: 0.00482
epssPercentile: 0.38915
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-21T20:59:16.873744Z'
scores:
  nvd: 7.1
  vendor: 6.5
ingestedAt: '2026-09-17T17:23:30.699Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-09-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44236.json)