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Fencer Vulns
high 7.1

CVE-2026-44236 json

rabbitmq-c: Heap buffer overflow in AMQP login handshake via undersized connection.tune.frame_max

published 2026-09-17 52 d ago modified 2026-09-29 41 d ago also BIT-rabbitmq-c-2026-44236 , EUVD-2026-82332 , GHSA-jh48-qjf5-fx5v

cvss
7.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

rabbitmq-c is a C-language AMQP client library for RabbitMQ. Prior to 0.16.0, a malicious AMQP server can send an undersized connection.tune.frame_max value during amqp_login(), and rabbitmq-c accepts the value in amqp_login_inner() in librabbitmq/amqp_socket.c. amqp_tune_connection() in librabbitmq/amqp_connection.c uses frame_max to reallocate the outbound buffer without enforcing AMQP_FRAME_MIN_SIZE. Immediate serialization of connection.tune-ok through amqp_frame_to_bytes() writes beyond the undersized heap allocation, causing memory corruption and likely denial of service. An on-path attacker can also trigger the flaw against plaintext AMQP traffic. Code execution is theoretically possible but was not demonstrated. This issue is fixed in version 0.16.0.

Patch / fix

  • bitnami rabbitmq-c 0.16.0
  • rabbitmq-c_project rabbitmq-c 0.16.0
  • librabbitmq Debian 12 0.11.0-1+deb12u2
  • librabbitmq Debian 13 0.15.0-1+deb13u1
  • librabbitmq Debian 14 0.16.0-1

debian advisories DEBIAN-CVE-2026-44236

  • librabbitmq Ubuntu 22.04 LTS 0.10.0-1ubuntu2.1
  • librabbitmq Ubuntu 24.04 LTS 0.11.0-1ubuntu0.1
  • librabbitmq Ubuntu 25.10 0.15.0-1ubuntu0.25.10.1
  • librabbitmq Ubuntu 26.04 LTS 0.15.0-1ubuntu0.26.04.1
  • librabbitmq Ubuntu Pro 14.04 LTS 0.4.1-1ubuntu0.1~esm2
  • 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-2026-44236

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

  • librabbitmq RHEL 10.2 0.14.0-3.el10_2.1
  • librabbitmq-tools RHEL 10.2 0.14.0-3.el10_2.1
  • librabbitmq RHEL 9 0.11.0-7.el9_8.1
  • librabbitmq-tools RHEL 9 0.11.0-7.el9_8.1
  • librabbitmq RHEL 8 0.9.0-6.el8_10
  • librabbitmq-tools RHEL 8 0.9.0-6.el8_10

red hat advisories RHSA-2026:84795RHSA-2026:82094RHSA-2026:75582

  • librabbitmq AlmaLinux 10 0.14.0-3.el10_2.1
  • librabbitmq-tools AlmaLinux 10 0.14.0-3.el10_2.1
  • librabbitmq AlmaLinux 9 0.11.0-7.el9_8.1
  • librabbitmq-tools AlmaLinux 9 0.11.0-7.el9_8.1

almalinux advisories ALSA-2026:84795ALSA-2026:82094

  • librabbitmq Rocky Linux 10 0.14.0-3.el10_2.1
  • librabbitmq Rocky Linux 9 0.11.0-7.el9_8.1
  • librabbitmq Rocky Linux 8 0.9.0-6.el8_10

rocky linux advisories RLSA-2026:84795RLSA-2026:82094RLSA-2026:75582

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-44236 updated cvss 6.5

rabbitmq-c: rabbitmq-c: Heap buffer overflow leading to denial of service

  • Red Hat Enterprise Linux 7 librabbitmq, librabbitmq-examples
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) librabbitmq-tools 0.9.0-6.el8_10
    fixed: vendor fix RHSA-2026:75582
  • Red Hat Enterprise Linux AppStream (v. 9) librabbitmq 0.11.0-7.el9_8.1, librabbitmq-tools 0.11.0-7.el9_8.1
    fixed: vendor fix RHSA-2026:82094
  • Red Hat Enterprise Linux AppStream (v. 10) librabbitmq 0.14.0-3.el10_2.1, librabbitmq-tools 0.14.0-3.el10_2.1
    fixed: vendor fix RHSA-2026:84795
  • Red Hat Enterprise Linux BaseOS (v. 8) librabbitmq 0.9.0-6.el8_10
    fixed: vendor fix RHSA-2026:75582
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) librabbitmq-devel 0.11.0-7.el9_8.1, librabbitmq-debuginfo 0.11.0-7.el9_8.1, librabbitmq-debugsource 0.11.0-7.el9_8.1, librabbitmq-tools-debuginfo 0.11.0-7.el9_8.1
    fixed: vendor fix RHSA-2026:82094
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) librabbitmq-devel 0.14.0-3.el10_2.1, librabbitmq-debuginfo 0.14.0-3.el10_2.1, librabbitmq-debugsource 0.14.0-3.el10_2.1, librabbitmq-tools-debuginfo 0.14.0-3.el10_2.1
    fixed: vendor fix RHSA-2026:84795
  • Red Hat Enterprise Linux CRB (v. 8) librabbitmq-devel 0.9.0-6.el8_10, librabbitmq-debuginfo 0.9.0-6.el8_10, librabbitmq-debugsource 0.9.0-6.el8_10, librabbitmq-tools-debuginfo 0.9.0-6.el8_10
    fixed: vendor fix RHSA-2026:75582

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
48 d ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-jh48-qjf5-fx5v referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
OSV 3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

Affected packages

ecosystem package affected fixed in
bitnami rabbitmq-c
<0.16.0
0.16.0

Affected products

  • alanxz rabbitmq-c

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Vulns 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.