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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-44235
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 18:16:43 UTC
Updated2026-09-30 17:43:24 UTC
Descriptionrabbitmq-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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS: 0.003090000 probability, percentile 0.238720000 (date 2026-11-09)

Problem Types: CWE-125 | CWE-191 | CWE-125 CWE-125: Out-of-bounds Read | CWE-191 CWE-191: Integer Underflow (Wrap or Wraparound)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Alanxz Rabbitmq-c affected < 0.16.0 Not specified

References

ReferenceSourceLinkTags
github.com/alanxz/rabbitmq-c/security/advisories/GHSA-9mmv-r8g3-qp46 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/alanxz/rabbitmq-c/releases/tag/v0.16.0 [email protected] github.com
github.com/alanxz/rabbitmq-c/commit/1d3afbb056fee5cc9ea05680bf32288715d0... [email protected] github.com
github.com/alanxz/rabbitmq-c/pull/878 [email protected] github.com
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