CRITICAL • CVSS 4.0

CVE-2025-62593

CISA KNOWN EXPLOITED

Ray is an AI compute engine. Prior to version 2.52.0, developers working with Ray as a development tool can be exploited via a critical RCE vulnerability exploitable via Firefox and Safari. This vulnerability is due to an insufficient guard against browser-based attacks, as the current defense uses the User-Agent header starting with the string "Mozilla" as a defense mechanism. This defense is insufficient as the fetch specification allows the User-Agent header to be modified. Combined with a DNS rebinding attack against the browser, and this vulnerability is exploitable against a developer running Ray who inadvertently visits a malicious website, or is served a malicious advertisement (malvertising). This issue has been patched in version 2.52.0.

Prioritization

NVD CVSS: 9.4
Published: Nov 26, 2025 6:15 PM EST
Modified: Aug 18, 2026 12:16 AM EDT
CISA KEV: Yes
KEV due date: 2026-08-20

CISA required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Red Hat context

No Red Hat-specific cached context is available for this record.

DEFENSIVE REMEDIATION WORKFLOW

Recommended response

Treat as priority because it appears in CISA Known Exploited Vulnerabilities data; follow the required action and due date where applicable.
Identify affected assets with Qualys, Tanium, software inventory, CMDB or configuration-management data.
Confirm package/application applicability before change execution; CVSS alone does not prove that every host is vulnerable.
Patch, upgrade, rehydrate or apply a vendor-approved mitigation through controlled change. GraceITS can automate eligible waves with Ansible/Tanium.
Rescan after remediation and reconcile remaining exceptions, false positives, unsupported systems and compensating controls.

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