Cpe:2.3:a:ibm:db2:11.5.0:*:*:*:*:*:*:* - CraftedSignal Threat Feedhttps://feed.craftedsignal.io/cpes/cpe2.3aibmdb211.5.0/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioThu, 10 Sep 2026 23:13:57 +0000https://feed.craftedsignal.io/favicon-32x32.pngCraftedSignal Threat Feedhttps://feed.craftedsignal.io/3232https://feed.craftedsignal.io/favicon.svgStack-Based Buffer Overflow in IBM Db2 DRDA Client Implementationhttps://feed.craftedsignal.io/briefs/2026-09-ibm-db2-buffer-overflow/Thu, 10 Sep 2026 23:13:57 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-09-ibm-db2-buffer-overflow/IBM Db2 versions 11.5.0-11.5.9 and 12.1.0-12.1.5 are vulnerable to a stack-based buffer overflow via malicious DRDA server responses, potentially leading to arbitrary command execution on clients.IBM Db2 versions 11.5.0 through 11.5.9 and 12.1.0 through 12.1.5 contain a critical stack-based buffer overflow vulnerability (CVE-2026-86093). The vulnerability resides in the Distributed Relational Database Architecture (DRDA) client-side implementation. When a Db2 client connects to a compromised or malicious DRDA server endpoint, the server can transmit specially crafted, oversized data packets. The Db2 client copies this user-controlled data into a fixed-size stack buffer without performing adequate bounds checking. This flaw allows an attacker who controls the endpoint to overwrite adjacent memory, which can be leveraged to achieve arbitrary command execution within the context of the client application process. Given that Db2 is often used in high-privilege enterprise environments, this vulnerability presents a significant risk to data integrity and internal network security.

Impact

Successful exploitation of CVE-2026-86093 allows an unauthenticated attacker, who successfully impersonates a legitimate DRDA server, to execute arbitrary commands with the privileges of the Db2 client process. This could result in full system compromise, lateral movement within the network, or exfiltration of sensitive database credentials and records. The vulnerability affects a broad range of enterprise Db2 versions currently deployed in production environments.

Recommendation

Prioritize the identification and patching of all affected IBM Db2 instances within the environment.

  • Upgrade all instances of IBM Db2 11.5.x and 12.1.x to the latest vendor-supplied patch levels that remediate CVE-2026-86093.
  • Audit network egress traffic from Db2 clients to identify connections to unauthorized or untrusted DRDA server endpoints (port 50000 by default).
  • Review IBM security bulletins for the specific version-specific fix availability related to CVE-2026-86093.
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