Red Hat Ansible Automation Platform Rrule Validation rrule redos

Summaryinfo

A vulnerability described as critical has been identified in Red Hat Ansible Automation Platform. Affected by this issue is some unknown functionality of the component Rrule Validation. Such manipulation of the argument rrule leads to redos. This vulnerability is traded as CVE-2026-125063. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Red Hat Ansible Automation Platform (unknown version). It has been rated as critical. Affected by this issue is an unknown code block of the component Rrule Validation. The manipulation of the argument rrule with an unknown input leads to a redos vulnerability. Using CWE to declare the problem leads to CWE-1333. The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential. Impacted is availability. CVE summarizes:

A flaw was found in the rrule validation of schedules in automation controller. Several non-anchored regular expressions with lazy wildcard prefixes are applied to the user-supplied rrule value; when the expected DTSTART/RRULE tokens are absent, validation time grows quadratically with the length of the value. An authenticated user can submit a large token-free rrule through the REST API, including the schedule preview endpoint, which requires no resource-level permissions; validation runs synchronously in the API web worker, so a single such request occupies a worker for an extended time and repeated requests can exhaust the web worker pool, denying access to the API and web UI while the attack is sustained. The impact is limited to availability.

The advisory is available at access.redhat.com. This vulnerability is handled as CVE-2026-125063 since 11/09/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/09/2026). This vulnerability is assigned to T1449.003 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Automation Software

Vendor

• Red Hat

Name

• Ansible Automation Platform

License

• open-source

Website

• Vendor: https://www.redhat.com/

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