Quick answers
- Is CVE-2026-86093 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-86093 being exploited in the wild.
- How severe is CVE-2026-86093?
- High severity, with a CVSS score of 7.5, published 10 September 2026.
- Which products and versions are affected?
- IBM Db2 11.5.0 through 11.5.9, 12.1.0 through 12.1.5.
- Is there a fix for CVE-2026-86093?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-86093 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-86093?
- Check whether you run IBM Db2 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A stack-based buffer overflow (CWE-121) exists in IBM Db2 versions 11.5.0–11.5.9 and 12.1.0–12.1.5 in the DRDA (Distributed Relational Database Architecture) client protocol handler. The vulnerability stems from improper bounds checking when copying user-controlled data from a DRDA server response into a fixed-size stack buffer. An attacker with the ability to control or impersonate a DRDA server endpoint can craft malicious protocol messages to overflow the buffer and execute arbitrary commands on the Db2 client. The attack vector is network-based and requires the ability to intercept or control the server endpoint; no client-side user interaction is required. IBM has released security updates for supported versions (V11.5.9 and V12.1.4/V12.1.5) available through Fix Central.
Affected products
- IBM Db2 11.5.0 through 11.5.9, 12.1.0 through 12.1.5
Timeline
- 2026-09-10: disclosed