What is CVE-2026-17354?

CVE-2026-17354 is a critical-severity vulnerability in IBM API Connect, classified under Path Traversal. CVSS score: 9.9/10. Published 2026-11-07.

How severe is CVE-2026-17354?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Path Traversal in IBM API Connect

CVE-2026-17354

IBM API Connect 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to perform arbitrary file writes due to path traversal.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2026-11-07 · last modified 2026-11-07.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (52.0th percentile), scored 2026-11-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

IBM API Connect

Weakness classification (CWE)

CWE-22 — Path Traversal

References

www.ibm.com/support/pages/node/7295635 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-17354?: CVE-2026-17354 is a critical-severity vulnerability in IBM API Connect, classified under Path Traversal. CVSS score: 9.9/10. Published 2026-11-07.
How severe is CVE-2026-17354?: Critical severity. CVSS v3 base score is 9.9 out of 10.