CVE-2026-18535 IBM API Connect Denial of Service

CriticalCVSS 9.6

Published: 2026-11-07 06:56
Updated: 2026-11-08 03:46
Exploit status: No public exploit known

Description

IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 are vulnerable to a Regular Expression Denial of Service (ReDoS) attack and to improper neutralisation of wildcard query operators.

Affected products

Product	Affected versions	Fixed in
ibm api connect	>= 12.1.0.0, <= 12.1.1.2	No fix listed
ibm api connect	>= 10.0.8.0, <= 10.0.8.12	No fix listed

References

www.ibm.com patch vendor-advisory
www.ibm.com patch vendor-advisory

CVSS v3.1

9.6 Critical

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Changed
Confidentiality: High
Integrity: None
Availability: High

Weakness & likelihood

EPSS (exploitation probability, 30 days): Not available
CWE: CWE-1333 Inefficient regular expression complexity

Public exploit references

Metadata only. CVERadar never hosts or runs exploit code.

No public exploit references known.