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CVE-2026-44236 (GCVE-0-2026-44236)

Vulnerability from cvelistv5 – Published: 2026-09-17 17:04 – Updated: 2026-09-17 17:04
VLAI
Title
rabbitmq-c: Heap buffer overflow in AMQP login handshake via undersized connection.tune.frame_max
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.
Severity
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
CWE
  • CWE-122 - Heap-based Buffer Overflow
Assigner
References
Impacted products
Vendor Product Version CPE status
alanxz rabbitmq-c Affected: < 0.16.0
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          "value": "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."
        }
      ],
      "metrics": [
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            "attackVector": "NETWORK",
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      },
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          "name": "https://github.com/alanxz/rabbitmq-c/releases/tag/v0.16.0",
          "tags": [
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          "url": "https://github.com/alanxz/rabbitmq-c/releases/tag/v0.16.0"
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      "source": {
        "advisory": "GHSA-jh48-qjf5-fx5v",
        "discovery": "UNKNOWN"
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      "title": "rabbitmq-c: Heap buffer overflow in AMQP login handshake via undersized connection.tune.frame_max"
    }
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  "cveMetadata": {
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    "datePublished": "2026-09-17T17:04:18.803Z",
    "dateReserved": "2026-05-05T15:42:40.519Z",
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    "state": "PUBLISHED"
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          }
        ],
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      "product_status:known_affected": "61",
      "source": "SUSE CSAF VEX",
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      "title": "SUSE CVE CVE-2026-44236",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-44236.json",
      "version": "2"
    }
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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