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CVE-2026-11831 is a heap-based buffer overflow vulnerability in IBM MQ Operator that allows an authenticated attacker to cause a limited denial of service and gain limited information about process memory layout via an out-of-bounds read triggered by a specially crafted client request. The vulnerability affects multiple specific versions of IBM MQ Operator. The CVSS 3.1 base score is 5.4, indicating medium severity.

IBM MQ Operator contains a heap-based buffer overflow (CWE-122) vulnerability identified as CVE-2026-11831. This flaw arises from an out-of-bounds read when processing specially crafted client requests, which can lead to a limited denial of service and disclosure of limited process memory layout information. The vulnerability requires the attacker to be authenticated and does not involve user interaction. It affects a broad range of IBM MQ Operator versions, including multiple minor releases across versions 2.x, 3.x, 4.x, 9.x, and 10.x. The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L, reflecting network attack vector, low attack complexity, and limited confidentiality and availability impact.

CVE-2026-11831 is a heap-based buffer overflow vulnerability in IBM MQ Operator that allows an authenticated attacker to cause a limited denial of service and gain limited information about process memory layout via an out-of-bounds read triggered by a specially crafted client request. The vulnerabi

CVE-2026-11831: CWE-122 Heap-based Buffer Overflow in IBM MQ Operator

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