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Fencer Vulns
medium 6.5

CVE-2026-15154 json

Guardrails-detectors: guardrails-detectors: unauthenticated regular-expression denial of service (redos) via detector_params.regex

published 2026-07-08 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-42382

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

A flaw was found in `guardrails-detectors`, a component of Red Hat OpenShift AI. This vulnerability, known as Regular Expression Denial of Service (ReDoS), allows a remote attacker to provide specially crafted regular expressions to the public detection API. This can cause catastrophic backtracking, leading to a worker process consuming 100% CPU indefinitely and resulting in a denial of service for the entire guardrails-mediated LLM pipeline.

Patch / fix

  • Red Hat Red Hat OpenShift AI 2.25 1784230964, 1787235925
  • Red Hat Red Hat OpenShift AI 3.3 1785137880, 1789573032
  • Red Hat Red Hat OpenShift AI 3.4 1783569145, 1786617316

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-15154 updated cvss 6.5

guardrails-detectors: guardrails-detectors: Unauthenticated Regular-Expression Denial of Service (ReDoS) via detector_params.regex

  • Red Hat OpenShift AI 2.25 rhoai/odh-built-in-detector-rhel9 1784230964, rhoai/odh-built-in-detector-rhel9 1787235925
    fixed: vendor fix RHSA-2026:65126
  • Red Hat OpenShift AI 3.3 rhoai/odh-built-in-detector-rhel9 1785137880, rhoai/odh-built-in-detector-rhel9 1789573032
    fixed: vendor fix RHSA-2026:53263
  • Red Hat OpenShift AI 3.4 rhoai/odh-built-in-detector-rhel9 1783569145, rhoai/odh-built-in-detector-rhel9 1786617316
    fixed: vendor fix RHSA-2026:60520
  • Red Hat OpenShift AI 2.25 rhoai/odh-rhel9-operator 1786112809, rhoai/odh-rhel9-operator 1788331391, rhoai/odh-vllm-cpu-rhel9 1786712073, rhoai/odh-dashboard-rhel9 1785940823, rhoai/odh-dashboard-rhel9 1788312226, rhoai/odh-modelmesh-rhel9 1788319539, +95 more Red Hat OpenShift AI 3.3 rhoai/odh-cli-rhel9 1790070206, rhoai/rhai-cli-rhel9 1790070206, rhoai/odh-mlflow-rhel9 1789653606, rhoai/odh-trainer-rhel9 1785187865, rhoai/odh-trainer-rhel9 1790136369, rhoai/odh-maas-api-rhel9 1790131842, +103 more Red Hat OpenShift AI 3.4 rhoai/odh-cli-rhel9 1787330837, rhoai/rhai-cli-rhel9 1787330837, rhoai/odh-automl-rhel9 1786612415, rhoai/odh-mlflow-rhel9 1787226790, rhoai/odh-autorag-rhel9 1786612637, rhoai/odh-trainer-rhel9 1784039162, +135 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat OpenShift AI 2.25
  • Red Hat Red Hat OpenShift AI 3.3
  • Red Hat Red Hat OpenShift AI 3.4

Classification

Weakness
  • CWE-1333 Inefficient Regular Expression Complexity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.