What is CVE-2026-17337?

CVE-2026-17337 is a high-severity vulnerability in IBM API Connect, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.4/10. Published 2026-11-07.

How severe is CVE-2026-17337?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in IBM API Connect

CVE-2026-17337

IBM API Connect 12.1.0.0 through 12.1.1.2 could allow a remote authenticated attacker to bypass authentication due to improper certificate validation. A certificate check is not performed reliably in all cases, which could allow a connection to be accepted without proper authentication.

Vulnerability class: Race Condition

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

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

IBM API Connect

Weakness classification (CWE)

CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

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

Frequently asked questions

What is CVE-2026-17337?: CVE-2026-17337 is a high-severity vulnerability in IBM API Connect, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.4/10. Published 2026-11-07.
How severe is CVE-2026-17337?: High severity. CVSS v3 base score is 7.4 out of 10.