CVE-2026-44235 rabbitmq-c: size_t underflow in AMQP frame length computation leads to out-of-bounds read
A malicious AMQP server can trigger an integer underflow in rabbitmq-c, causing an out-of-bounds read and application crash.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-44235?
CVE-2026-44235 is a medium-severity vulnerability in alanxz rabbitmq-c, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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 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.
Which versions are affected by CVE-2026-44235?
1 open source package ship an affected version, including rabbitmq-c.
| Package | Affected | Fixed in |
|---|---|---|
rabbitmq-c Bitnami | All versions | 0.16.0 |
How do I fix CVE-2026-44235?
Upgrade rabbitmq-c to 0.16.0 or later.
Is CVE-2026-44235 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44235 exists.
Sources
Also known as AZL-105084, BIT-rabbitmq-c-2026-44235, DEBIAN-CVE-2026-44235, ECHO-0351-ee63-bf06, GHSA-9mmv-r8g3-qp46, UBUNTU-CVE-2026-44235.