CVE-2025-62593: Ray-Project Ray

What is CVE-2025-62593?

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.

CVSS8.8 NVD 3.1

SeverityHIGH

Exploitation In the wild In CISA KEV

EPSS62% · P99

Triage statusActive Exploit

ActionPatch immediately

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWECWE-94

NVD published2025-11-26

NVD last modified2026-10-01

Timeline

2025-11-26Published to the U.S. National Vulnerability Database (NVD)
2026-08-17Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
2026-08-19First covered in a defend.network daily briefing
2026-08-20CISA federal remediation deadline (BOD 22-01)
2026-10-01NVD record last updated

CISA Known Exploited Vulnerability

Ray-Project Ray Code Injection Vulnerability

Added to KEV2026-08-17

Federal patch deadline2026-08-20

Known ransomware useUnknown

Affected product

Ray-Project Ray

Remediation Steps

Apply the vendor security update for Anyscale Ray as a priority.
Restrict network exposure of the affected service to trusted sources until patched.
Review logs and detections for indicators of exploitation.
Confirm fixed versions against the official vendor advisory before deploying.

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 2 of September 2026 (September 14 – 20)
Vulnerability Priority Report – Week 1 of September 2026 (September 7 – 13)
Vulnerability Priority Report – Week 5 of August 2026 (August 31 – September 6)
Vulnerability Priority Report – Week 4 of August 2026 (August 24 – 30)
Vulnerability Priority Report – Week 3 of August 2026 (August 17 – 23)
Microsoft Copilot, MLflow, and Windows Task Host under attack; ransomware exploitation confirmed (2026-08-19)

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🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.