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Fencer Intel
critical 9.8

CVE-2026-61547 json

rabbitmq-c: Heap Buffer Overflow in amqp_send_frame() When Serializing Oversized AMQP_FRAME_BODY

published 4mo ago modified yesterday also EUVD-2026-121281 , GHSA-hfjv-vcp3-39wh

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository alanxz/rabbitmq-c. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
9.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

Summary

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.

Patch / fix

  • librabbitmq Debian 12 0.11.0-1+deb12u3
  • librabbitmq Debian 13 0.15.0-1+deb13u2
  • librabbitmq Debian 14 0.17.0-1

debian advisories DEBIAN-CVE-2026-61547

  • librabbitmq Ubuntu 22.04 LTS 0.10.0-1ubuntu2.2
  • librabbitmq Ubuntu 24.04 LTS 0.11.0-1ubuntu0.2
  • librabbitmq Ubuntu 26.04 LTS 0.15.0-1ubuntu0.26.04.2
  • librabbitmq Ubuntu Pro 16.04 LTS 0.7.1-1ubuntu0.2+esm1
  • librabbitmq Ubuntu Pro 18.04 LTS 0.8.0-1ubuntu0.18.04.2+esm1
  • librabbitmq Ubuntu Pro 20.04 LTS 0.10.0-1ubuntu0.20.04.1~esm1

ubuntu advisories UBUNTU-CVE-2026-61547

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • alanxz rabbitmq-c

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of alanxz/rabbitmq-c published their own advisory on GitHub. Reviewed sources take precedence over it.