alanxz rabbitmq-c up to 0.15.x AMQP Parser amqp_connection.c amqp_handle_input target_size out-of-bounds

Summaryinfo

A vulnerability has been found in alanxz rabbitmq-c up to 0.15.x and classified as problematic. The impacted element is the function amqp_handle_input of the file librabbitmq/amqp_connection.c of the component AMQP Parser. This manipulation of the argument target_size causes out-of-bounds. This vulnerability appears as CVE-2026-44235. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in alanxz rabbitmq-c up to 0.15.x and classified as problematic. Affected by this vulnerability is the function amqp_handle_input of the file librabbitmq/amqp_connection.c of the component AMQP Parser. The manipulation of the argument target_size with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-44235 since 05/05/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

Upgrading to version 0.16.0 eliminates this vulnerability.

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Productinfo

Vendor

• alanxz

Name

• rabbitmq-c

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15

Website

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

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