# CVE-2026-61547: rabbitmq-c: Heap Buffer Overflow in amqp_send_frame() When Serializing Oversized AMQP_FRAME_BODY

Status: published. Published: 2026-11-10. Updated: 2026-11-14.

rabbitmq-c is a C-language AMQP client library for RabbitMQ. Prior to version 0.17.0, a heap buffer overflow exists in rabbitmq-c when the public amqp_send_frame() API is used to serialize an oversized AMQP_FRAME_BODY. The issue occurs because amqp_frame_to_bytes() copies frame.payload.body_fragment.len bytes into the connection outbound buffer without validating that the body fragment fits within the allocated frame buffer. An application that passes an oversized body frame to amqp_send_frame() can trigger a heap out-of-bounds write, resulting in process crash and memory corruption. This issue has been patched in version 0.17.0.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- alanxz / rabbitmq-c: < 0.17.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.0: 9.8 (critical); CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: GitHub_M

- CVSS 3.0: 9.8 (critical); CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: 0.39% as of 2026-11-13; percentile 33.97%

- SSVC: exploitation poc; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-787

## Exploit evidence

- exploit: https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-hfjv-vcp3-39wh (ADP: CISA-ADP)

## References

- https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-hfjv-vcp3-39wh (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/alanxz/rabbitmq-c/pull/892 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/alanxz/rabbitmq-c/releases/tag/v0.17.0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-hfjv-vcp3-39wh (ADP: CISA-ADP; exploit)

- https://github.com/alanxz/rabbitmq-c/pull/892 (security-advisories@github.com)

- https://github.com/alanxz/rabbitmq-c/releases/tag/v0.17.0 (security-advisories@github.com)

- https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-hfjv-vcp3-39wh (security-advisories@github.com)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-61547; retrieved 2026-11-14; source updated 2026-11-14

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-61547; retrieved 2026-11-13; source updated 2026-11-12

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-61547; retrieved 2026-11-14; source updated Not reported

Revision: 13caad70f1208e3d3ee3999f4957df294cbb22fee8aa660d8e2ca49069b35118

Canonical: https://y2.dev/cve/CVE-2026-61547

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