Quick answers
- Is CVE-2026-15266 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-15266 being exploited in the wild.
- How severe is CVE-2026-15266?
- Critical severity, with a CVSS score of 9.8, published 8 November 2026.
- Which products and versions are affected?
- IBM Concert 1.0 through 3.0.1.1; IBM Concert Platform prior to 3.0.3; IBM Concert Protect prior to 3.1.0.
- Is there a fix for CVE-2026-15266?
- 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-2026-15266 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-15266?
- Check whether you run IBM Concert, IBM Concert Platform or IBM Concert Protect 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
The vulnerability stems from unsafe command execution in third-party components bundled with IBM Concert 1.0–3.0.1.1. Multiple high-severity CVEs are present, including command injection flaws (CVE-2026-9277 in shell-quote), memory-safety issues (CVE-2026-33815 in pgx), and resource exhaustion bugs. An unauthenticated network attacker can exploit these to achieve remote code execution and denial of service.
Affected products
- IBM Concert 1.0 through 3.0.1.1
- IBM Concert Protect prior to 3.1.0
- IBM Concert Platform prior to 3.0.3
Timeline
- 2026-11-08: disclosed