A Regular Expression Denial of Service (ReDoS) vulnerability (CVE-2026-15154) exists in the guardrails-detectors component of Red Hat OpenShift AI. This vulnerability allows remote attackers to send specially crafted regular expressions to the public detection API, causing catastrophic backtracking and resulting in a worker process consuming 100% CPU indefinitely. This leads to denial of service for the guardrails-mediated large language model pipeline. The issue affects specific versions of Red Hat OpenShift AI and has been assigned a medium severity rating with a CVSS score of 6.5. Red Hat has released updated images and version 2.25.10 to address this vulnerability.