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Fencer Vulns
medium 6.5

CVE-2026-44235 json

rabbitmq-c: size_t underflow in AMQP frame length computation leads to out-of-bounds read

published 2026-09-17 53 d ago modified 2026-09-30 39 d ago also BIT-rabbitmq-c-2026-44235 , EUVD-2026-82333 , GHSA-9mmv-r8g3-qp46

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
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 HEADER or METHOD frame during client login and cause unsigned size_t underflow in amqp_handle_input() in librabbitmq/amqp_connection.c. The parser subtracts HEADER_SIZE, fixed per-frame fields, and FOOTER_SIZE from state->target_size without first checking the minimum frame length. The wrapped encoded.len value is passed through amqp_decode_properties() to amqp_decode_table_internal(), where it defeats bounds checks and causes an out-of-bounds read and process crash. An on-path attacker can also trigger the issue when AMQP traffic is not protected by TLS with certificate validation. The demonstrated impact is denial of service, with no reliable memory disclosure or code execution shown. 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-2026-44235

  • 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-2026-44235

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

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-2026-44235 updated cvss 6.5

rabbitmq-c: github.com/alanxz/rabbitmq-c: rabbitmq-c: Denial of Service via AMQP frame length underflow

  • Red Hat Enterprise Linux 7 librabbitmq, librabbitmq-examples Red Hat Enterprise Linux 8 librabbitmq, librabbitmq-tools Red Hat Enterprise Linux 9 librabbitmq, librabbitmq-tools Red Hat Enterprise Linux 10 librabbitmq
    affected: workaround, no fix available “Fix deferred”

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
52 d ago

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/alanxz/rabbitmq-c/security/advisories/GHSA-9mmv-r8g3-qp46 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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-125 Out-of-bounds Read
  • CWE-191 Integer Underflow (Wrap or Wraparound)

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.