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CVE-2026-44235— rabbitmq-c: size_t underflow in AMQP frame length computation leads to out-of-bounds read

Quick assessment

Affected
alanxz rabbitmq-c
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

rabbitmq-c 是用于 RabbitMQ 的 C 语言 AMQP 客户端库。在 0.16.0 之前，恶意的 AMQP 服务器可以在客户端登录过程中发送长度不足的 HEADER 或 METHOD 帧，从而在 librabbitmq/amqp_connection.c 中的 amqp_handle_input() 函数中引发无符号 size_t 下溢。解析器在检查最小帧长度之前，会从 state->target_size 中减去 HEADER_SIZE、每个帧的固定字段以及 FOOTER_SIZE。经过包装的 e

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1595 · Active Scanning

Affected Version Matrix 1

VendorProduct Version RangeStatus
alanxz rabbitmq-c < 0.16.0 affected
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I. Basic Information for CVE-2026-44235

Vulnerability Information
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Vulnerability Title
rabbitmq-c: size_t underflow in AMQP frame length computation leads to out-of-bounds read
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
alanxz rabbitmq-c < 0.16.0 -

II. Public POCs for CVE-2026-44235

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III. Intelligence Information for CVE-2026-44235

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Patches & Fixes for CVE-2026-44235 (2)

Vendor Advisories for CVE-2026-44235 (1)

Vendor Pages for CVE-2026-44235 (1)

IV. Related Vulnerabilities

Same product: rabbitmq-c
Same vendor: alanxz
Same weakness: CWE-125

V. Comments for CVE-2026-44235

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