Vulnerability details

CVE-2026-18535

IBM API Connect

IBM API Connect Denial of Service

CVSS 3.1

9.6Critical

Official 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.

CVSS scores

Score	Version	Source	Vector
9.6Critical	3.1	CVEProject cvelistV5 (CNA) (ibm)	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H`

Affected products

Vendor	Product	Versions	Source
IBM	API Connect	10.0.8.0 ≤ v ≤ 10.0.8.12	CVEProject cvelistV5 (CNA)
IBM	API Connect	12.1.0.0 ≤ v ≤ 12.1.1.2	CVEProject cvelistV5 (CNA)

References and advisories

https://www.ibm.com/support/pages/node/7291753 vendor-advisorypatch
https://www.ibm.com/support/pages/node/7292434 vendor-advisorypatch

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Details

Published: 2026-11-07
Last updated: 2026-11-08
State: Published
Assigner (CNA): ibm
Kolun priority: 20 · Low

Exploit prediction (EPSS)

0.28%

Probability of exploitation in 30 days

21.3%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-1333
Inefficient regular expression complexity