SB20260907115 - Multiple vulnerabilities in RabbitMQ C client

Description

This security bulletin contains information about 2 vulnerabilities.

1) Heap-based buffer overflow (CVE-ID: CVE-2026-61547)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause memory corruption.

The vulnerability exists due to a heap-based buffer overflow in amqp_frame_to_bytes() when serializing an oversized AMQP_FRAME_BODY through amqp_send_frame(). A remote attacker can provide an oversized AMQP_FRAME_BODY frame to cause memory corruption.

The overflow occurs while serializing the frame, before any network communication with a RabbitMQ broker.

2) Integer overflow (CVE-ID: CVE-2026-59986)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to disclose sensitive information or cause a denial of service.

The vulnerability exists due to an integer overflow in the amqp_decode_bytes function when parsing AMQP BYTES or UTF8 field lengths. A remote attacker can send a crafted AMQP frame containing an oversized field length to disclose sensitive information or cause a denial of service.

Only 32-bit systems are affected; exploitation may require a malicious AMQP broker or a man-in-the-middle position on an unencrypted connection.

Remediation

Install update from vendor's website.

References

• https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-hfjv-vcp3-39wh
• https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jgjf-7fwf-f3c7