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CVE-2026-59986— rabbitmq-c: amqp_decode_bytes size_t integer overflow bypasses bounds check on 32-bit (OOB 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 是一个用于 RabbitMQ 的 C 语言 AMQP 客户端库。在 0.17.0 版本之前，边界检查表达式 在 32 位系统上，当 大于 时会发生整数溢出。其中， 是从 AMQP 网络协议中读取的 类型值，表示 BYTES 或 UTF8 字段的长度。该溢出会导致检查值回绕为一个较小的数值从而通过验证，最终生成一个 字段高达数 GB 的 结构，但其指向的却是小型帧缓冲区。这会在 32 位系统（包括 ARM、MIPS、x86 ILP32 架构以及嵌入式 IoT AMQP 客户端）上引发最多约 4G

CVSS 7.4 · High
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I. Basic Information for CVE-2026-59986

Vulnerability Information
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Vulnerability Title
rabbitmq-c: amqp_decode_bytes size_t integer overflow bypasses bounds check on 32-bit (OOB read)
Source: CVE Program / CVE List V5
Vulnerability Description
rabbitmq-c is a C-language AMQP client library for RabbitMQ. Prior to version 0.17.0, the bounds check (*offset = o + len) <= encoded.len overflows when o + len > SIZE_MAX on 32-bit systems. len is a uint32_t read from the AMQP wire as a BYTES/UTF8 field length. The overflow wraps the check to a small value that passes, producing a decoded amqp_bytes_t with a multi-GB .len pointing into a small frame buffer. This results in an out-of-bounds read of up to ~4GB of process memory on 32-bit systems (ARM, MIPS, x86 ILP32, embedded IoT AMQP clients). Enabling information disclosure or denial of service. Not exploitable on 64-bit systems where size_t is 64-bit. This issue has been patched in version 0.17.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
alanxz rabbitmq-c < 0.17.0 -

II. Public POCs for CVE-2026-59986

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III. Intelligence Information for CVE-2026-59986

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Other References for CVE-2026-59986 (3)

IV. Related Vulnerabilities

Same product: rabbitmq-c
Same vendor: alanxz
Same weakness: CWE-190