IBM API Connect 10.0.8.x/12.1.0.x ReDoS & wildcard query vulnerability
CVE-2026-18535 Published on November 7, 2026
IBM API Connect Denial of Service
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.
Vulnerability Analysis
CVE-2026-18535 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity, and a high impact on availability.
Weakness Type
What is a ReDoS Vulnerability?
The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. Some regular expression engines have a feature called "backtracking". If the token cannot match, the engine "backtracks" to a position that may result in a different token that can match. Backtracking becomes a weakness if all of these conditions are met:
CVE-2026-18535 has been classified to as a ReDoS vulnerability or weakness.
Products Associated with CVE-2026-18535
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Affected Versions
IBM API Connect:- Version 12.1.0.0, <= 12.1.1.2 is affected.
- Version 10.0.8.0, <= 10.0.8.12 is affected.