RayPublished 26 Nov 2025NVD status: Analyzed

CVE-2025-62593

Ray is an AI compute engine.

ComponentRay
Severityhigh (CVSS 8.8)
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published (NVD)2025-11-26
Last modified2026-10-01
Affected versions
< 2.52.0
Fixed in2.52.0
WeaknessCWE-94CWE-352
CISA KEVlisted 2026-08-17

NVD description

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.

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.

What to do

  • Upgrade Ray to 2.52.0 or later.
  • Do not expose the component's API or UI to the internet without authentication in front of it.
  • It is exploited in the wild: treat unpatched hosts as compromised, rotate the secrets they hold and review their logs.

Sources