---
id: CVE-2026-44235
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 HEADER or METHOD frame during
  client login and cause unsigned size_t underflow in amqp_handle_input() in
  librabb…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-125
  - CWE-191
vendor: alanxz
product: rabbitmq-c
affected:
  - rabbitmq-c < 0.16.0
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T18:16:43.850'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-44235'
references:
  - url: >-
      https://github.com/alanxz/rabbitmq-c/commit/1d3afbb056fee5cc9ea05680bf32288715d0d802
    label: security-advisories@github.com
  - url: 'https://github.com/alanxz/rabbitmq-c/pull/878'
    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-9mmv-r8g3-qp46
    label: security-advisories@github.com
  - url: >-
      https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-9mmv-r8g3-qp46
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44235.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-44235'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2536755'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-44235'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-44235'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-17T17:43:01.618019Z'
ingestedAt: '2026-09-17T17:23:30.697Z'
epss: 0.00356
epssPercentile: 0.26652
---

## 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 HEADER or METHOD frame during client login and cause unsigned size_t underflow in amqp_handle_input() in librabbitmq/amqp_connection.c. The parser subtracts HEADER_SIZE, fixed per-frame fields, and FOOTER_SIZE from state->target_size without first checking the minimum frame length. The wrapped encoded.len value is passed through amqp_decode_properties() to amqp_decode_table_internal(), where it defeats bounds checks and causes an out-of-bounds read and process crash. An on-path attacker can also trigger the issue when AMQP traffic is not protected by TLS with certificate validation. The demonstrated impact is denial of service, with no reliable memory disclosure or code execution shown. 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** · Moderate · 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 2026-09-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44235.json)