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CVE-2026-18535— IBM API Connect Denial of Service

Quick assessment

Affected
IBM API Connect
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

IBM API Connect 10.0.8.0 至 10.0.8.12 版本，以及 12.1.0.0 至 12.1.1.2 版本，存在正则表达式拒绝服务（ReDoS）攻击漏洞，以及通配符查询操作符未正确中和的漏洞。

CVSS 9.6 · Critical

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-18535

Vulnerability Information
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Vulnerability Title
IBM API Connect Denial of Service
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
IBM API Connect 12.1.0.0 ~ 12.1.1.2 cpe:2.3:a:ibm:api_connect:12.1.0.0:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-18535

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III. Intelligence Information for CVE-2026-18535

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Other References for CVE-2026-18535 (2)

Same Patch Batch · IBM · 2026-11-07 · 209 CVEs total

CVE-2026-17336 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17399 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17392 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17402 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-16884 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-16920 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17049 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17359 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17354 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17410 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17342 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17117 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17239 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17158 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17150 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17298 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17147 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17132 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17146 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect
CVE-2026-17134 9.9 CRITICAL Multiple Vulnerabilities in IBM API Connect

Showing top 20 of 209 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: API Connect
Same vendor: IBM
Same weakness: CWE-1333